Question

The area of sector AOB is 39.6cm square.What is the area of sector BOC?Take pie 22/7 or 3.142

Answer 1

Asector AOC=39.6cm

Asector AOB=56/360×3.142r^2
39.6=175.952r^2
CROSS MULTIPLY
175.952r^2/175.952=14256/175.952
r^2=81.02
SQUARE ROOT BOTH SIDES
Square root r^2=Square root 81.02
r=9.00~9
Asector BOC=70/360×3.142×81
A7ector BOC=17815.14/360
Asector BOC=49.48~49.5cm square