In the diagram PQR is a semicircle. If PQ=16cm and QR=12cm calculate, correct to three significant figures,
a. The radius of the circle
b. the area of the shaded portion
AAAaannndd the bot gets it wrong yet again!
PQ and QR are the legs of a right triangle
so the diameter PR = 20
a. The radius of the circle = 14 cm
b. The area of the shaded portion = 88.3 cm²