Area of a circle =πr2 Where r= radius Diameter =2x radius 154=
22
7
×r2 Get rid of the fraction by multiplying both sides of the equation by the denominator (7) 154×7=22×r2 Divide both sides of the equation by 22
154×7
22
=r2
Note: 22 divides itself once and 154, 7 times. 7×7=r2 72=r2 Since the powers are the same, the bases are also the same. 7=r Radius =7cm Diameter =2x radius Diameter =2×7cm=14cm