Question

question 37 of 44
what is the circumference of the circle below? (round your answer to the nearest tenth.)
circle with center a and radius 9 cm
a. 56.5 cm
b. 254.5 cm
c. 28.3 cm
d. 113.1 cm

Explanation:

Step1: Recall circumference formula

The formula for the circumference \( C \) of a circle is \( C = 2\pi r \), where \( r \) is the radius.

Step2: Identify the radius

From the diagram, the radius \( r = 9 \) cm.

Step3: Substitute and calculate

Substitute \( r = 9 \) into the formula: \( C = 2\times\pi\times9 = 18\pi \). Using \( \pi \approx 3.1416 \), we get \( C \approx 18\times3.1416 \approx 56.5488 \).

Step4: Round to nearest tenth

Rounding \( 56.5488 \) to the nearest tenth gives \( 56.5 \).

Answer:

A. 56.5 cm