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The side of a rhombus is 5 cm and one of...

The side of a rhombus is 5 cm and one of its diagonal is 8 cm. What is the area of the rhombus?
एक समचतुर्भुज की भुजा 5 सेमी तथा इसका एक विकर्ण 8 सेमी का है | इस समचतुर्भुज का क्षेत्रफल ज्ञात करें |

A

`30 cm^2`

B

`20 cm^2`

C

`40 cm^2`

D

`24 cm^2`

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