Question

Area of a circle is 154 cm2. Find its diameter.
class 7​

Answer 1

Given

Area of a circle = 154 cm²

Area of a circle = pi × radius × 2

2 × 22/7 × r = 154

r = 154 × 1/2 × 7/22

r = 7 × 7 / 2

r = 49/2

r = 24.5

Diameter = 2 × r

Diameter = 24.5 × 2

= 49cm

Hope this helps!