Suppose P, Q, and R are points in the plane such that PQ = 1.8, PR = 8.2, and angle PQR = 90 degrees. What is the perimeter of angle PQR?
PR is the hypotenuse of a right triangle and PQ is a leg
So √ [ PR^2 - PQ^2 ] = QR = √ [ 8.2^2 - 1.8^2 ] = √ 64 = 8
So.........the perimeter of PQR ≈ 8.2 + 8 + 1.8 = 18 units
