Question

What is the circumference of the circle? use pi = 3.14. round your answer to the nearest tenth of the centimeter.

a. 20.4 cm
b. 81.6 cm
c. 132.7 cm
d. 40.8 cm

Answer 1

The circumference of a circle is found via the equation:
`C= \pi d`, d being the diameter of the circle.

Therefore, we know the diameter of the circle is 13 cm. Let us plug this into the equation:


`C=13 \pi`

The question says to use 3.14 for
`\pi`, so let's plug that in and solve:


`C=3.14*13=40.82`

The question states that we need to round to the nearest tenth, so since the hundredths place contains a 2, we round down to 40.8 cm.

Therefore, we now know the circumference of the circle is D) 40.8 cm.