The area of the shadow triangle is 15 square centimeters, the area of the trapezoid is 5cm at the top and 9cm at the bottom See the answer (5 + 9) × (15 divided by 5) / 2 = 21 square centimeters, but why is 15 divided by 5 the height of a trapezoid

The area of the shadow triangle is 15 square centimeters, the area of the trapezoid is 5cm at the top and 9cm at the bottom See the answer (5 + 9) × (15 divided by 5) / 2 = 21 square centimeters, but why is 15 divided by 5 the height of a trapezoid

1. In your question, if the shadow triangle is based on 5, then the answer should be wrong,
Because, the area of triangle = bottom × height △ 2
Therefore, height = area × 2 △ bottom
15 △ 5 is not the height of a trapezoid
2. The corresponding height of 5cm (also trapezoidal height) is:
15 × 2 △ 5 = 6 (CM)
3. The area of trapezoid: (5 + 9) × 6 △ 2 = 42 (CM & # 178;)

The area of triangle is s square centimeter, the bottom is 5cm, so the height is
A. 2S ÷ 5 square centimeter
B. S △ 2 △ 5 square centimeter
C. S △ 5 square centimeter

Area of triangle = bottom × height △ 2
So high = 2S △ 5
A

A glass with a bottom area of 15cm square is filled with water 3cm high. Now put a cylinder with a bottom radius of 1cm and a height of 5cm into the water. How much does the water rise

Analysis: after the small cylinder is put in, the bottom area of the container needs to subtract the bottom area of the small cylinder. The original water volume divided by the front bottom area is the water level after the small cylinder is put in. The water level minus the original water height is the amount of water rise. The water volume = 15 × 3 = 45 cm & # 179; the bottom area of the container after the small cylinder is 15-3.14 ×

The height of the bottom edge of an isosceles triangle is equal to 5cm. If the height of the isosceles triangle is increased by LCM, the area of the original triangle will be increased by 3cm

The height of the bottom edge of an isosceles triangle is equal to 5cm. If the height of the isosceles triangle is increased by LCM, the area will be increased by 3cm, compared with the area of the original triangle of 15cm