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A parallelogram is equal to the bottom of a triangle, their ratio of height is 1:2, and their ratio of area is () A. 2：1B. 4：1C. 1：1D. 1：2
Let the height of the parallelogram be h, then the height of the triangle be 2h, then the area of the parallelogram = bottom × h, the area of the triangle = bottom × 2H △ 2 = bottom × h, so the area of the parallelogram: the area of the triangle = 1:1, so choose C
The area and height of a triangle and a parallelogram are equal. The bottom of a triangle is 18 decimeters. How many decimeters is the bottom of a parallelogram?
A triangle and a parallelogram have the same area and height,
The bottom of the triangle is 18 decimeters,
The base of the parallelogram is 9 decimeters
If the height of a triangle is 20 cm, the height of a parallelogram is ()
A. 10 cm B. 20 cm C. 40 cm
The area of triangle is: S = ah1 ／ 2, the area of parallelogram is: S = ah2, from the equal area: ah1 ／ 2 = ah2, H1 ／ 2 = H2, because the height of triangle is H1 = 20 cm, so the height of parallelogram is: 20 ／ 2 = 10 (CM), a: the height of parallelogram is 10 cm
RELATED INFORMATIONS
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