Question

1. what is the exact circumference of a circle that has a radius of 10 cm?

20π cm
100π cm
10π cm
200π cm

Explanation:

Step1: Recall the formula for the circumference of a circle

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

Step2: Substitute the given radius into the formula

We are given that the radius \( r = 10 \) cm. Substituting \( r = 10 \) into the formula \( C = 2\pi r \), we get \( C = 2\pi\times10 \).

Step3: Simplify the expression

Simplifying \( 2\pi\times10 \) gives \( 20\pi \) cm.

Answer:

A. \( 20\pi \) cm