Question

calculate the circumference.
formula:
c = 2πr
use 3.14 for π.
c = ? cm
round to the nearest tenth.

Explanation:

Step1: Substitute the values into the formula

Given the formula \( C = 2\pi r \), where \( r = 9\) cm and \( \pi=3.14\).
So, \( C = 2\times3.14\times9\).

Step2: Calculate the result

First, \( 2\times3.14 = 6.28\).
Then, \( 6.28\times9=56.52\).
Rounding \( 56.52\) to the nearest tenth gives \( 56.5\).

Answer:

\(56.5\) cm