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Question

The diagonals of a rhombus are 32cm and 24cm, respectively. The perimeter of the rhombus is

A
80cm
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B
72cm
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C
68cm
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D
88cm
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Solution

The correct option is D 80cm
In a rhombus, the diagonals bisect each other at 900.
Referring the diagram, if PR=32cm,SQ=24cm, then OP=16cm,OQ=12cm
Since POQ is a right angled triangle,
PQ2=OP2+OQ2=>162+122=400
PQ=400=20cm
Hence, the length of the sides of the rhombus =20cm.
Since the length of all sides of a rhombus are equal,
Perimeter =4× length of one side =4×20=80cm

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