If sides of a triangle are 12 cm, 15 cm and 21 cm, then what is the inradius (in cm) of the triangle?

If sides of a triangle are 12 cm, 15 cm and 21 cm, then what is the in

1.	If sides of a triangle are 12 cm, 15 cm and 21 cm, then what is the inradius (in cm) of the triangle?
A.	(5√3)/2
B.	4√3
C.	(3√6 )/2
D.	3√3
Answer» D. 3√3

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If sides of a triangle are 12 cm, 15 cm and 21 cm, then what is the inradius (in cm) of the triangle?

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