Question

ABCD is a parallelogram whose area is 60 $c{m}^2$. The area of triangle AEB is __ $c{m}^2$.

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Answer 1

If a triangle and a parallelogram are on the same base and between the same parallels, then the area of the triangle is equal to half the area of the parallelogram.
$\text{Thus, area of triangle AEB is}\frac{1}{2}\times 60=30c{m}^2$.