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Question

In rhombus ABCD, AB = 7.5 cm, and AC = 12 cm. Find the area of the rhombus.

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Solution

In ABO, AOB=90°, AO=12AC=6 cm,
AB = 7.5 cm


OB2=AB2OA2=(7.5)262=56.2536=20.25

OB=20.25=4.5cm

BD=2×OB=9cm

Area of rhombus =12d1×d2=12×9×12cm2=54cm2


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