Question

1. a car wheel has a radius of 13 inches. what is the approximate circumference of tire? (use 3.14 as an approximation for π\pi)

a. 40.5 in.
b. 81.6 in.
c. 100.2 in.
d. 65.0 in.

Explanation:

Step1: Recall the formula for circumference

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

Step2: Substitute the given values

Given \(r = 13\) inches and \(\pi\approx3.14\). Then \(C=2\times3.14\times13\).
First, calculate \(2\times13 = 26\). Then \(C = 3.14\times26\).
\(3.14\times26=(3 + 0.14)\times26=3\times26+0.14\times26=78+3.64 = 81.64\approx81.6\) (rounded to one - decimal place).

Answer:

B. 81.6 in.