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Question

Find the area of the rhombus having each side equal to 17 cm and one of its diagonals equal to 16 cm.


A

240 cm2

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B

480 cm2

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C

400 cm2

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D

550 cm2

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Solution

The correct option is A

240 cm2


ABCD is a rhombus in which AB=BC=CD=DA=17 cm
AC=16 cm

Therefore, AO=8cm
In AOD,
AD2=AO2+OD2
172=82+OD2
289=64+OD2
225=OD2
OD=15
Therefore, BD=2OD
=2×15
=30 cm
Now, area of rhombus
=12×16×30
=240 cm2


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