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If sides of a triangle are 12cm, 15 cm a...

If sides of a triangle are 12cm, 15 cm and 21 cm, then what is the in-radius (in cm) of the triangle?
यदि एक त्रिभुज को भुजाएँ 12 सेमी., 15 सेमी. तथा 21 सेमी है, तो त्रिभुज की अंत त्रिज्या (सेमी. में) क्या है?

A

`((5 sqrt3))/2`

B

`4 sqrt3`

C

`(3 sqrt6)/2`

D

`3 sqrt3`

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