Question

25. If the area of a circle is 144cmthen find
a. lts diameter
b. Its circumference​

Answer 1

a. lts diameter = 13.540550005146 cm

b. Its circumference​ = 42.538892421732 cm

Explanation:

suppose A the area ; d the Diameter ; P the circumference and r the radius

A = πr²

P = d×r = 2πr

then

r² = A/π = 144÷π = 45.836623610466

then

→ r = √(45.836623610466) = 6.770275002573

d = 6.770275002573×2 = 13.540550005146

→ P = 13,.540550005146×π = 42.538892421732