Question

A triangle PQR circumscribes a circle of radius r such that angle Q=90 degree (angle) Given that, PQ = 3 cm and QR = 4 cm. Find the radius of the circle.

Answer 1

use the formula :
r = pqr/(4A)
with r = radius,
p,q, and r are = the length of sides (triangle)
A = area of triangle

Answer 2

so, u must determine all sides of triangle and its area too
and then just plug of them to that formula