Question

1.What is the circumference of a circle with a diameter of 2.9 cm?

Use 3.14 for pi.

Enter your answer as a decimal in the box.


___ cm

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2.What is the circumference of a circle with a radius of 7.9 inches?

Use 3.14 for pi.

Enter your answer as a decimal in the box.


____ in.

Answer 1

1. C =9.106 cm 2.C =49.612 inches

Explanation:

To solve these problems, we will follow the steps below;

First write down the formula for calculating the circumference of the circle

C= 2πr

where c is the circumference of the circle and r is the radius of the circle

1) From the question diameter = 2.9 cm, but radius is half of the diameter, this implies that radius =
`(d)/(2)`=
`(2.9)/(2)`=1.45 cm

We can now proceed to insert the values into the formula;

C= 2πr

= 2×3.14×1.45

=9.106 cm

C =9.106 cm

2) From the question, radius = 7.9 inches and π=3.14

We can now go ahead to insert the values into the formula C= 2πr

C = 2×3.14× 7.9

=49.612 inches

C =49.612 inches

Answer 2

(1) 9.106 cm

(2) 49.612 inches

Explanation: