4. Find the area of a rhombus whose side is 12cm and whose altitude is 6cm. If one of the diagonals is 9cm long, find the length of the other diagonal.
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- Wehaveside
=6cmheight=4cmAreaofa∥gm=base×height=6×4=24cm2Areaofarhombus=21×d1×d2⇒24=21×8×d2⇒d2=824×2∴d2=6Hence,otherlengthis6cm.
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