Simple trapezoidal calculation 10, simple trapezoidal calculation

You need to know the angle between the waist and the bottom, but if it is not clearly indicated, it will be calculated at 45 degrees.

Bottom 45, Top: Bottom = 1:4, Bottom.

Go over the top two vertices to make the bottom perpendicular line, and you get a rectangle in the middle. The upper and lower sides of the rectangle are equal to the top edge of the trapezoid, and the trapezoid is an isosceles trapezoid, which should be at an angle of 45 degrees to the bottom edge, so the right-angled side of the triangle on both sides = (The trapezoidal side should be the beveled side of the triangle = 2

It's very simple, you extend the waist to a point to form an isosceles triangle, because the top is 1:4 than the bottom, so the trapezoidal waist accounts for three points, so it is 45 4 * 3 is the length of the trapezoidal waist, it is very simple, it is similar to use, and then compare, think about it yourself!

The ratio of the upper and lower edges is 1:4, which means that the lower edge is 4 times that of the upper edge

The question you're talking about is very general. I only know that the ratio is 1:4, then I'm going to ask.

Is it 1:4 for the top and bottom or 1:4 for the waist on both sides?

Or is your trapezoidal right-angled trapezoid, isosceles trapezoid, or irregular trapezoid??? It can't be calculated without the corresponding conditions!!

Only you can understand your questions.

。。What a title?

Then divide the bottom by four.

The upper and lower bottom edges of the trapezoid are parallel, the height of both sides is equal, both are h, the square of the length of the hypotenuse = the square of the height + the square of (the bottom of the bottom - the bottom of the top) (assuming that the bottom bottom is longer than the length of the top bottom) In other words: the length and height of the part of the bottom that is more than the bottom are two right-angled sides, and the trapezoidal hypotenuse is the hypotenuse of a triangle, and these three lines form a right-angled triangle.

The above formula is the Pythagorean theorem of a right triangle.

Obtained by using the above formula, you can find the hypotenuse: the length of the hypotenuse = (h?+(l down - l up)?)

The calculation of the trapezoidal funnel is the calculation of the triangular pyramid, and the volume is one-third of the volume of the cylinder of the same height as the bottom area, and the volume of the cylinder is the base area multiplied by the height.

Divide the trapezoid into two triangles and a rectangle, calculated using the Pythagorean theorem or using the sine and cosine theorem.

Perimeter formula for trapezoid:

1) The circumference formula of the trapezoid: upper bottom + lower bottom + waist + waist.

2) The circumference formula of an isosceles trapezoid: upper bottom + lower bottom + 2 waist.

Area formula for trapezoid:

1) The area formula of the trapezoid: (upper bottom + lower bottom) High 2, represented by letters:

Deformation: h=2s (a+c); Deformation 2: a=2s h-c; Deformation 3: c = 2s h-a. (S area, A top bottom, C bottom bottom, H height).

2) The area formula of the trapezoid: median line high, represented by letters: l·h.

3) The trapezoidal area perpendicular to each other is: diagonal, diagonal 2.

Area formula for fractional trapezoid:

The formula for the area of the fractional trapezoid: (upper base + lower bottom) high 2, represented by letters: s=(a+b) h 2.

Deformation 1: h=2s (a+b); Deformation 2: a=2s h-b; Deformation 3: b = 2s h-a.

Another formula for calculating the area of a trapezoid: median line height, represented by letters: l·h.

The area of the trapezoidal where the diagonals are perpendicular to each other is: diagonal diagonal 2.

Trapezoidal area = (upper bottom + lower bottom) height 2

Represented by letters: s=(a+b) h2

The trapezoidal area formula (top bottom + bottom bottom) x height 2

The area of the trapezoid = (upper bottom + lower bottom) x height 2

The formula for calculating the area of a trapezoid is (upper bottom + lower bottom) height 2

The formula for calculating the trapezoid is as follows:

1. The formula for calculating the circumference of the trapezoid: circumference = upper bottom + lower bottom + waist + waist.

It is represented by letters: L=A+B+C+D (let the length of the upper bottom be A, the length of the lower bottom is B, the length of the two waists is C, D, and the circumference is L).

2. The formula for calculating the circumference of an isosceles trapezoid: circumference = upper bottom + lower bottom + 2 waist.

Represented by letters: L=A+B+2D (Let the length of the upper bottom be A, the length of the lower bottom is B, the length of the two waists is C, D, and the circumference is L, due to the isosceles trapezoidal.)

The length of the two waists is equal, that is, C = D, simplification can obtain L = A + B + 2D) 3, the area formula of the trapezoid: area = (upper bottom + lower bottom) High 2 is represented by letters: s = (a + b) * h 2 (let the upper bottom length of the trapezoid be a, the lower bottom length is b, the height is h, and the area is s).

The formula for calculating the trapezoid is as follows:

1. The formula for calculating the circumference of the trapezoid: circumference = upper bottom + lower bottom + waist + waist is represented by letters: L = A + B + C + D (the length of the upper bottom is A, the length of the lower bottom is B, the length of the two waists is C and D respectively, and the circumference is L).

2. The formula for calculating the circumference of an isosceles trapezoid: circumference = upper bottom + lower bottom + 2 waist is represented by letters: L = A + B + 2D (Set the length of the upper bottom to A, the length of the lower bottom to B, the length of the two waists is C and D, and the circumference is L, due to the isosceles trapezoid.)

The length of the two waists is equal, that is, C = D, simplification can obtain L = A + B + 2D) 3, the area formula of the trapezoid: area = (upper bottom + lower bottom) High 2 is represented by letters: s = (a + b) * h 2 (let the upper bottom length of the trapezoid be a, the lower bottom length is b, the height is h, and the area is s).

Area formula (top bottom + bottom bottom) x height 2

Circumference formula Top bottom + bottom bottom + two other sides.

Trapezoidal area = (upper bottom + lower bottom) height 2

Hope it helps.

The area formula of the trapezoid = (upper bottom + lower bottom) high.

The area formula is (top bottom + bottom bottom) High 2

1. The area formula of the trapezoid: (upper bottom + lower bottom) height 2

The area of the trapezoid is equal to half of the product of the sum of the upper and lower bases and the height. If the upper and lower bases of the trapezoid are represented by a and b respectively, and the height is represented by h, the area of the trapezoid is s=(a+b) h2.

2. The area formula of the trapezoid: the median line is high.

According to the length of the median line of the trapezoid, which is equal to half of the sum of the upper and lower bases, the area of the trapezoid is also equal to the product of the median line and the height. If the median line of the trapezoid is denoted by m and the height is denoted by h, the area of the trapezoid is s=mh.

3. The area of the ladder closed old shape perpendicular to each other is: diagonal diagonal 2.

The two waists of the waist trapezoid are equal, the two elementary base angles of the isosceles trapezoid on the same base are equal, the two diagonals of the isosceles trapezoid are equal, the isosceles trapezoid is an axisymmetric figure, and the axis of symmetry is the straight line where the line connecting the midpoint of the upper and lower bases is located.

Expansion of the car and the exhibition information:

To determine that an arbitrary quadrilateral is an isosceles trapezoid, if the determination theorem of the isosceles trapezoidal cannot be directly applied, the general method is to decompose the quadrilateral into a familiar polygon by making auxiliary lines, in this case by making parallel lines, decomposing the quadrilateral into a parallelogram and an isosceles triangle.

Make a diagonal parallel line over the vertex, concentrate the quantitative relationship and position relationship of the two diagonals into a triangle, and convert the length of the upper and lower bottom of the trapezoid into the length of the hypotenuse of the right triangle.

The longer bottom edge is called the bottom bottom, and the shorter bottom edge is called the bottom bottom; The other two sides are called the waist; The perpendicular segment sandwiched between the two bases is called trapezoidal height. A trapezoid with a waist perpendicular to the bottom is called a right-angled trapezoid. A trapezoid with two equal waists is called an isosceles trapezoid.

A group of quadrilaterals where the opposite sides are parallel and the other is not parallel to the opposite sides is a trapezoid. A group of quadrilaterals with parallel and unequal opposite sides is trapezoidal.

The trapezoid only has an area formula, and the perimeter formula is the upper bottom + lower bottom + two waist lengths, I hope it can help you!

Area: (upper bottom + lower bottom) x height divided by 2, the perimeter formula of the trapezoid: upper bottom + lower bottom + two waists.

The area formula of the trapezoid: (upper bottom + lower bottom) height 2

Trapezoidal area formula: (top bottom + bottom bottom) height 2

s trapezoidal: ( a + b ) h 2

When the diagonal lines of the trapezoidal are perpendicular to each other, it can be calculated by half of the product of the diagonal.

The area of the harrier can be found by half of the product of the diagonal, and the area of the special trapezoid, that is, the area of the trapezoidal where the diagonal lines are perpendicular to each other can be found by this method, and the area of any plane figure where the diagonals are perpendicular to each other can be found by this method.

If the two diagonals are perpendicular, it can be counted like that, otherwise it is absolutely not.

When the diagonal of a convex quadrilateral is perpendicular and its area is equal to half of the product of the two diagonals, it is not possible.

Addendum: the diagonal of the isosceles trapezoidal is not necessarily vertical, tease the beam do not hearsay, prove it yourself!

It can be calculated in this way in some special quadrilaterals ((the diagonals are perpendicular to each other) called the zheng), if the trapezoidal diagonal hangs straight to each other, otherwise it can't. You can deduce it, it's not very troublesome. Give it a try!

Summary. First of all, the height of eight meters is divided into 16,000 parts according to centimeters, because centimeters = meters, so eight meters = 8,000 millimeters = 16,000 parts. Then calculate the area according to the trapezoidal formula and multiply it by the length of 28 meters to get the volume:

Upper bottom: 16,000 copies * cm = 8 meters Bottom bottom: 2 meters high:

8 m area: (top bottom + bottom bottom) *height 2 = 8 m + 2 m) *8 m 2 = 40 m² volume: 40 m² * 28 m = 1,120 cubic meters Therefore, the volume of the trapezoidal shape of eight meters high and two meters at the bottom is 1,120 cubic meters.

1.Trapezoidal area of the public stove Li Liang type: trapezoidal area = upper bottom + lower bottom) height 22

Keystone height formula: trapezoidal height = upper bottom - lower bottom) 2 left hypotenuse + right hypotenuse) 3Trapezoidal side length formula:

Left hypotenuse = lower bottom cos (the angle between the left hypotenuse and the horizontal line) right hypotenuse = upper bottom cos (the hidden angle between the right hypotenuse and the horizontal line).

Eight meters high at the top and bottom centimeters at the bottom, two meters long, 28 meters long, how many cubic meters?

8 meters high, top bottom meters, bottom bottom, 20 meters long, how many cubic meters do you count?

It's only ten cubic meters!

Hello, this is based on the area formula.

Won't you count?

Two dollars is the result of this!

Hello classmate, you are asking about the formula of the trapezoid.

First of all, the height of eight meters is divided into 16,000 parts according to centimeters, because centimeters = meters, so eight meters = 8,000 millimeters = 16,000 parts. Then calculate the area according to the trapezoidal formula and multiply it by 28 meters in length, and Daqing can get the volume: upper bottom:

16,000 servings * cm = 8 m bottom : 2 m high: 8 m area:

Upper bottom + lower bottom) *Height 2 = 8 m + 2 m) *8 m 2 = 40 m² Volume: 40 m² Smile * 28 m = 1,120 cubic meters Therefore, the volume of the trapezoidal shape of eight meters high and two meters at the bottom is 1,120 cubic meters.

Yes, it's trapezoidal.

Yes, classmates.