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Question

In a given square ABCD, if the area of triangle ABD is 36 cm2, find
(i) the area of triangle BCD; (ii) the area of the square ABCD

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Solution

ABCD is a square
BD is the diagonal
We know that the diagonal divides the square into two congruent triangles.
ABD BCD
Area of ABD =area of BCD
Area of ABD = 36cm2 (given)
Area of BCD = 36cm2
Area of the square ABCD = Area of ABD + Area of BCD = 36cm2 +36cm2
Area of the square ABCD = 72cm2

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