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The area of a trapezoid is 16 square centimeters, and the sum of the top and bottom is 8 centimeters. How many centimeters is the height?
Trapezoidal area formula: (upper bottom + lower bottom) × height △ 2
Height = area × 2 ^ (upper bottom + lower bottom)
So: 16 × 2 △ 8
=32÷8
=4（cm）
If you don't understand, please ask questions!
The area of a trapezoid is 100 square centimeters, the upper bottom is 8 centimeters, the lower bottom is 12 centimeters, how much is the height cm? The solution of the equation
Set the height to X
Then 1 / 2 (8 + 12) * x = 100
So x = 10
The area of a trapezoid is 128 square centimeters. It is known that its upper bottom is 12 centimeters and its height is 8 centimeters. How many centimeters is its lower bottom?
solve equations
Let its base be x cm
（12+x）*8*1/2=128
（12+x）*4=128
48+4x=128
4x=128-48
4x=80
x=20
The area of a trapezoid is 200 square centimeters, its upper bottom is 8 centimeters, its height is 12 centimeters, how many centimeters is its lower bottom?
There are two oil barrels. Barrel a has 45 kg of oil, and barrel B has three times as much oil as barrel A. how many kg of oil are there in two barrels?
For a cylindrical glassware with an inner bottom radius of 6cm, first pour some water into it, and the height of the water surface is 10cm. Then put a cone plumb with a total height of 9cm into the water. After immersion, the height of the water surface is 0.5cm higher than the original. What is the bottom area of the cone in square centimeter?
Hehe, I don't know anything about mathematics
(1) The area of trapezoid is (upper bottom + lower bottom) * height / 2
So the bottom is 200 * 2 / 12-8 = 76 / 3cm
(2) B barrel of oil 45 * 3 = 135 kg, two barrels of oil 135 + 45 = 180 kg
(3) The volume of a cone is 1 / 3 * s * H
The added volume of the cone is pi * 6 ^ 2 * 0.5 = 18pi cubic centimeter
The volume of a cone is 18 PI
Bottom area s = 18pi * 3 / 9 = 6pi square centimeter
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