Circumference and Area of a Circle

Practice

Circumference of parts of circles - Answers

1. The answer

The arc length of the semicircle is 4 \pi units.

(Note that we could also multiply 4 by 3.14 to get 12.56 units.)

2. The answer

The arc length of the partial circle is 3.5 \pi units.

(Note that we could also multiply 3.5 by 3.14 to get 10.99 units.)

3. The answer

The arc length of the partial circle is \frac{1}{2} \pi units.

(Note that we could also multiply \frac{1}{2} by 3.14 to get 1.57 units.)

4. The answer

The arc length of the semicircle is 6 \pi units.

(Note that we could also multiply 6 by 3.14 to get 18.84 units.)