Question

The circumference of a circle is 8cm. Find the area of sector whose central angle is 72

Answer 1

2πr=8 so r= 8/2π=4/π . centeral angle(theta))=72°. Area of sector = πr^2× theta/360°=π×4/π ×4/π ×72/360=4×4/π ×1/5.=4×4×7/22×5=2×4×8/11×5=56/55 cm^2.