Mathematical problems about finding the height of a trapezoid junior high school .

After d is made df ab and the bc edge is at point f, so the quadrilateral adfb is a parallelogram.

Over d as dg bc on g

Because the angle c = 60 degrees, df = ab = cd

So DCF is a regular triangle.

So cf=df=ad

Because ab=dc, the angular bad is 120

ab=ad, so the angle adb=30

Since ae=1, ad=2, cf=cd=2, so cg=1

Therefore: dg = root number 3

That is, the height of the trapezoidal ABCD is the root number 3

I don't know, I can't help you!

o( o haha

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

The so-called trapezoid is a quadrilateral shape in which only one set of opposite sides is parallel.

The parallel group of opposite sides is called the upper and lower bottoms, and the other two non-parallel sides are called waist vertical shots, and the vertical upper and lower line segments sandwiched in the middle are high.

In this Gonghe trap formula, the area of the trapezoid is involved, so the area of the trapezoid, its Yu Xiao calculation method is (upper bottom + lower bottom) high 2.

In addition, there is a special figure in the trapezoid, that is, the right-angle trapezoid, that is to say, there is a waist that is perpendicular to the upper and lower bottoms, so this special trapezoid, its vertical line is the waist on its side, that is, the height of this trapezoid is the length of the waist of the trapezoid.

You can't find the height, you also need to know the area.

Height = Area 2 Top Bottom + Bottom Bottom).

Answering process:1The area formula for a trapezoid: area = (top bottom + bottom bottom) height 2.

2.Area = (top bottom + bottom bottom) height 2. Divide both sides of the equation by (top + bottom) to get: area (top + bottom) = high 2.

3.Multiply both sides of the equation by 2 at the same time to get the lead envy: high = area 2 upper bottom + lower bottom).

Summary. This is the height of the triangle with a base of 5, which is also the height of the trapezoid.

Find the height of the trapezoid.

Well. It can be found by using the equal area of the triangle, and the formula for the area of the triangle is the base times the height divided by two.

So the high is 3 4 2 2 5

This is the height of the triangle with a base of 5, which is also the height of the trapezoid.

The height of the trapezoidal area is x2 (top bottom, bottom bottom).

Since Lu Cheng answers the area of the trapezoid (upper and lower bottom) x height 2, the height area of the trapezoid can be obtained by conversion x 2 (upper bottom and lower bottom).

Triangles, parallelograms, and trapezoids all have "height", and the teaching content of "height" belongs to the content of geometry, which is a discipline that studies the size, position and shape of figures.

"Height" is a line segment, and the height of the triangle is "a perpendicular line from any vertex of the triangle to the line where its opposite side is located, and the line segment between this point and the perpendicular foot is called the height of the triangle." "The height of the trapezoid" is "from any point on the bottom of the trapezoidal to the straight line where the bottom of the other is to do a perpendicular line, and the line segment between this point and the vertical foot is called the height of the trapezoid, and the height between the two fronts or waists cannot be made.

The trapezoidal hall laughs on a flat graphic, and the pretending Tong Han is not three-dimensional, and there is no volume. The formula for the area of the trapezoid: (top and bottom, bottom and bottom) wheel object height 2. The volume formula of the bezel: Upper and lower area Lower bottom area (Upper and lower area Area) High 3.

The area formula of the trapezoid: (top bottom bottom bottom bottom) height 2

The volume formula of the bezel: Upper and lower area Lower bottom area (Upper and lower area Area) High 3.

In the case of a trapezoidal cross-section, the volume of earthwork for a ditch (embankment), etc.: trapezoidal area Length.

Commonly used guides.

1. Make a height (determined according to the actual topic);

Figure 4: Commonly used guide line practices.

Figure 4: Commonly used guide line practices.

2. Translate one waist;

3. Translate the diagonal;

4. Reverse extension of the two waists at one point;

5. Take the midpoint of one waist, and connect and extend the two ends of the other waist;

6. Take the midpoint of two bottoms, and make parallel lines of the two waists through the midpoint of one bottom.

7. Take the midpoint of the two waists and connect them to make the median line.