Question

what is the circumference of a circular disc with a diameter of 10 centimeters? (round your answer to the nearest tenth.)

a. 15.7 cm

b. 62.8 cm

c. 47.1 cm

d. 31.4 cm

Explanation:

Step1: Recall circumference formula

The formula for the circumference \( C \) of a circle is \( C = \pi d \), where \( d \) is the diameter.

Step2: Substitute the diameter value

Given \( d = 10 \) cm, substitute into the formula: \( C=\pi\times10 \). Using \( \pi\approx3.14 \), we get \( C = 3.14\times10 = 31.4 \) cm.

Answer:

D. 31.4 cm