Circumference and Area of a Circle

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.)