The area of trapezoid is six square meters, the length of bottom is four meters, and the length of height is two meters

The area of trapezoid is six square meters, the length of bottom is four meters, and the length of height is two meters

Let the upper and bottom be XM, then
1/2×(x+4)×2=6
x+4=6
x=2

There is a trapezoidal land. Its upper bottom is three and a half meters, its lower bottom is five and a half meters, and its area is seventeen and a fifth of four square meters. How high is the trapezoidal land?

17 4 / 5 × 2 ^ (3 1 / 2 + 5 2 / 5)
＝17.8×2÷（3.5＋5.4）
= 4 (m)

1. A trapezoid is three tenths of a meter at the top, two fifths of a meter at the bottom and five fifths of a meter at the bottom. What is its area? 2. For a project, Party A will complete it in ten days, Party B will complete it in fifteen days, and now Party A will complete it in four days, and Party B will complete it in three days. What are the parts of the project?

（3|10+2|5）*5/7÷2=1/4

The upper bottom of a trapezoid is two fifths of a decimeter, the lower bottom is four fifths of a decimeter, and the area is 21 square decimeters. What is the height of this trapezoid?

According to the trapezoidal area formula: (upper bottom + lower bottom) × height / 2 = area
It is known that: height = area × 2 / (upper bottom + lower bottom) = 21 × 2 / (2 / 5 + 4 / 5) = 35 decimeters
So the height is 35 decimeters

A triangle has been expanded twice, its height has been reduced by half, and its area has become larger or smaller or unchanged

If the bottom of the triangle is expanded to twice the original height and reduced by half, the area will remain unchanged, right?

It depends on whether your height is higher than your bottom. If not, the area will change. If the area remains unchanged

The bottom of a triangle is expanded by 4 times, the height is reduced to half, and the area is ()
A. Expand to twice the original B. unchanged C. shrink to half the original D. cannot be determined

Because the area of triangle is s = 12Ah, so s ′ = 12 × 4A × 12h = ah = 2S, the bottom of a triangle is expanded by 4 times, and the area is 2 times when the height is reduced to half of the original

A triangle and a parallelogram have the same base and area. The height of a triangle is 12 meters and that of a parallelogram is () meters

Let the base length of triangle be x and the height of parallelogram be y
According to the conditions, the equation 12 * x / 2 = XY is obtained, and the similar terms on both sides are reduced to 6 = y, that is, the height of the quadrilateral is 6m

The bottom of a parallelogram is 15 meters and its height is 18 meters. A triangle with the same area is 18 meters. What's its height

15 * 18 * 2 / 18 = 30m

The height and area of a parallelogram and a triangle are equal. The bottom length of the parallelogram is 1.2 meters. How many meters is the bottom length of the triangle?

1.2 × 2 = 2.4m
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