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3.01 Unit Checkpoint: Circles and Composite Figures
UNIT CHECKPOINT:
Circles and Composite Figures
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What is the circumference of a circle with a radius of 9.7 inches?
Use 3.14 for pi.
Enter your answer as a decimal in the box.
in.
123456

Verified Answer :

GinnyAnswer

To find the circumference of a circle, we use the formula:

\(\[ C = 2 \pi r \]\)

Where:
- \(\( C \)\) represents the circumference,
- \(\( \pi \)\) (pi) is approximately 3.14,
- \(\( r \)\) is the radius of the circle.

Given the radius \(\( r = 9.7 \)\) inches and using \(\( \pi = 3.14 \)\), the circumference calculation proceeds as follows:

1. Substitute the values into the formula:
\(\[ C = 2 \times 3.14 \times 9.7 \]\)

2. Perform the multiplication step-by-step:
- First, multiply 3.14 by 9.7:
\(\[ 3.14 \times 9.7 = 30.458 \]\)

- Next, multiply the result by 2 to account for the \(\( 2 \pi r \)\) part of the formula:
\(\[ 2 \times 30.458 = 60.916 \]\)

Therefore, the circumference of the circle is:

\(\[ 60.916 \, \text{inches} \]\)

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