What is the formula for the waist of the isosceles trapezoid

An isosceles trapezoid is a set of quadrilaterals in which the opposite sides are parallel (not equal) and the other is not parallel but equal. An isosceles trapezoidal is a flat figure that is a special trapezoidal shape. Waist length 2=[(bottom - bottom) 2] 2+height 2;Waist length = root number.

Determination of isosceles trapezoid:

1. One group of opposites are equal and not parallel, and the other group of quadrilaterals with parallel opposites is an isosceles trapezoid.

2. A trapezoid with two equal angles on the same bottom is an isosceles trapezoid.

3. A trapezoid with equal diagonal lines is an isosceles trapezoid.

4. A trapezoid with equal waists is an isosceles trapezoid.

The following decisions are not used as theorems:

5. A quadrilateral with equal diagonals and two isosceles triangles is an isosceles trapezoid.

6. The diagonally complementary trapezoidal is an isosceles trapezoid.

The circumference of an isosceles trapezoid = upper bottom + lower bottom + 2 waist.

"a", "b", and "c" respectively represent the upper bottom, lower bottom, and two waists of the trapezoid, and "c" represents the circumference of the isosceles trapezoid, then c=a+b+2c.

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

"a", "b", and "h" are used to indicate the upper bottom, lower bottom, and height of the trapezoid, respectively, and "s" indicates the area of the trapezoid.

then s=(a+b)h2.

The following algorithm is available for special cases.

1. If the diagonals are perpendicular to each other, the area is the product of 1 2 diagonals.

2. The median line is multiplied by the height.

Waist length = [(bottom - bottom bottom) 2] + height

Waist length =

Isosceles trapezoidal circumference = upper base length + lower bottom length + 2 waist length.

The characteristic of the isosceles trapezoid is that the two waists are equal, the two bottom corners on the same bottom are also the same size, and the two diagonals are also the same, and the isosceles trapezoid is an axisymmetric figure.

The length of the base edge of a group of parallelograms is equal to the sum of the upper and lower bases of the isosceles trapezoid; The height of the base edge of the parallelogram is higher than that of the isosceles trapezoid.

There are several formulas, as follows: 1. The trapezoidal perimeter formula c = upper bottom + lower bottom + two waist lengths 2. The perimeter formula of the isosceles trapezoid: upper bottom + lower bottom + 2 waist 3, trapezoidal area formula:

s=1 2 (upper bottom + lower bottom) * height 4, trapezoidal area formula: median line x height 5, diagonal perpendicular to each other trapezoidal area is: diagonal x diagonal 2 friends, if it helps you, please give a like, thank you.

h=5/cos70

The circumference of an isosceles trapezoidal shape = upper base length + lower base length + 2 waist length.

If the bottom angle = 60 degrees, the bottom length of the bottom and the length of the upper bottom:

The right-angled side of the right-angled triangle at 30 degrees = half of the hypotenuse, waist length = [(lower base length - upper bottom length) 2] 2

Bottom length - Bottom length, circumference = top bottom length + bottom length + 2 waist length.

Upper bottom length + lower bottom length + 2 (bottom length - top bottom length).

3 Bottom length - Upper bottom length.

There are a number of ways to achieve a high of 30.

First, the top bottom is shifted upwards by 10, so that the height is 30, and the bottom is unchanged. The length of the top bottom also does not change.

The second kind, the length of the upper bottom is unchanged, the upward translation is 10, so that the height is 30, the inclination of the waist is unchanged, the two ends of the upper bottom are parallel to the original waist, and the bottom is along the long line and AB point, and the length of the bottom is AB.

The length of ab = (30 * 10 20 *) 2 + 800 = 830 (the number in parentheses in the formula, 30 is the current height, 20 is the original height, the upper and lower bottom ends and the lower bottom ends, and the perpendicular line made by the upper and lower bottom ends and the bottom bottom form a right triangle, and the length of ab is obtained by using the similarity between the original and the present.

There are several more, slightly.