Question

Find the approximate value of the circumference of a circle with the given radius. Use pi = 3.14. Round your results to one more decimal than in the given radius.

5.1 cm

C =

A. 32.03 cm
B. 32.02 cm
C. 16.02 cm
D. 16.01 cm

Answer 1

Option A is correct.

Circumference of a circle = 32.03 cm

Explanation:

Circumference of a circle(C) is given by:

`C = 2 \pi r` .....[1]

where,

r is the radius of the circle.

As per the statement:

Use pi = 3.14.

Radius of the circle(r) = 5.1 cm

Substitute these given values in [1] to find C;

`C = 2 \cdot 3.14 \cdot 5.1`

Simplify:

C = 32.028 cm

Therefore, the approximate value of the circumference of a circle is, 32.03 cm

Answer 2

C = 2πr
C = 2 * 3.14 * 5.1
C = 32.028

You can round that to A. 32.03, because if the decimal after 2 is greater than it, then you round it to the number which is higher than it, which is 3.