In a parallelogram ABCD,AB=10cm and the altitude corresponding to the sides AB and AD are respectively 7cm and 8cm.find AD?
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area of parallelogram = base × altitude
base AB = 10
altitude = 7
area = 10 × 7 = 70
case 2
base AD = x
altitude = 8
area = 70
70 = 8 × x
x = 70 ÷ 8
x = 8.75 cm
therefore side AD = 8.75 cm
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