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Question

Diagonals of a rhombus are in ratio 4:3. find their lengths if area of that rhombus is 24cm2.

A
3 cm, 4 cm
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B
6 cm, 8 cm
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C
9 cm, 12 cm
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D
12 cm, 16 cm
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Solution

The correct option is B 6 cm, 8 cm
Let common multiple of length of the diagonals be y.

According to given condition
Area of rhombus = 12×(product of diagonals)
24 = 12×(4y×3y) = 6y
y2 = 246 = 4
y = 4
y = 2
Hence
Lengths of diagonals are 3y and 4y.
diagonal 1 = 3y = 3×2 = 6 cm.
diagonal 2 = 4y = 4×2 = 8 cm.

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