Question

find the radius of a circle whose circumference is 30.8 cm​

Answer 1

Answer:

0.1cm

Step-by-step explanation:

$c = 2\pi \times r$

c = 30.8

$\frac{22}{7} \times 2 \times r$

$\frac{30.8}{7} = 2 \times 22 \times r$

$\frac{4.4}{44} = r$

$0.1 = r$

Answer 2

Answer:

4.90 cm

Step-by-step explanation:

Radius = r = ?

Circumference  = 2 * π * r = 30.8

2 * π * r = 30.8

2 * 3.14 * r = 30.8

6.28 * r = 30.8

r = 30.8 / 6.28

r = 4.90 cm

So, the radius of the circle is 4.90 cm.