21.In a parallelogram ABCD, AB = 8 cm. The altitudes corresponding to sides AB and AD are respectively 4 cm and 5 cm. Find measure of AD.
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22.
In the given figure:
(a) name the two triangles on the same base AB and between the same parallels. (b) name a triangle and a parallelogram on the same base BC and between the same parallels.
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23.In the given figure, ABC and DBC are triangles on the same base and between parallel lines l and m. If AB = 3 cm, BC = 5 cm, ∠A = 90°, find area of ΔDBC.
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24.In the figure, ar (ΔABE) = 50 cm2. Find the area of the parallelogram ABCD. Give reasons.
Short Answer Type
area of parallelogram PQRS.
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