Question

construct a triangle PQR with PQ=12cm,QR=13cm,PR=5cm.construct its incircle .what is its inradius?​

Answer 1

Answer:

$12 {}^{2} = 13 { }^{2} + 5 {}^{2} \\ 144 = 169 + 25 \\ 144 = 194 \\ = 194 - 144 \\ = 50$