Question

Find the circumference of a circle whose area is 301.84 cm².

Answer 1

Area of circle = 301.84 cm².

et radius = r cm

Area of circle = 𝜋r²

𝜋r² = 301.84

`22/7xxr^2` = 301.84

`r^2 = (301.84×7)/22 = (sqrt(7 × 7))^(1/2) × 13.75`

`r = sqrt(13.72 × 7) = sqrt(7 × 7 × 1.96) = 7 × 1.4 = 9.8` cm

Radius = r = 9.8 cm

Circumference = 2 × r = 2 ×`22/7`× 9.8

= 44 × 1.4

= 61.6 𝑐𝑚