Question 23

PQR is an equilateral triangle whose side is 10 cm. What is the value (in cm) of the inradius of triangle PQR?

Solution

Semi peremeter,S=(10+10+10)/2=15 .

Area,K=(√3/4)×10×10=25√3.

So,inradius,r=(25√3/15)=(5/√3).

A is correct choice.

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