Question

c. Find the radius of a circle whose circumference is:
i) 15.4 cm.​

Answer 1

$\sf \Large Solution!!$

Circumference = 15.4 cm

Circumference = 2πr

15.4 = 2 × (22/7) × r

15.4 = (44/7) × r

r = (7/44) × 15.4

r = 2.45 cm

Radius = 2.45 cm

Answer 2

$\sf \Huge Answer!!$

$\sf \to Circumference=15.5\:cm$

$\sf \to Circumference=2\pi r$

$\sf \to 15.4\:cm=2\times \dfrac{22}{7}\times r$

$\sf \to 15.4\:cm=\dfrac{44}{7}\times r$

$\sf \to r=\dfrac{7}{44}\times 15.4\:cm$

$\sf \to r=\dfrac{107.8\:cm}{44}$

$\sf \to r=2.45\:cm$

$\boxed{\blue{\sf Radius=2.45\:cm}}$