Question

find the circumference of a circle whose diameter is 10.5 km​

Answer 1

Answer:

Explanation:

C = 2πr

D = r/2

D = 10.5

r =?

r = 2×10.5

r = 21

Therefore

C = 2×3.14×21

C = 132.006cm

Answer 2

Answer:

32.97 km

Explanation:

Given :  diameter=10.5 km

              radius=10.5/2=5.25 km

               circumference of a circle = 2 X π X radius

                                                          = 2 X 3.14 X 5.25

               circumference of the circle = 32.97 km