Circumference and Area of a Circle

1. The answer

The area of the shape is $3 \pi$ units $^{2}$.

(Note that we could also multiply 3 by $3.14$ to get $9.42$ units $^{2}$.)

2. The answer

The area of the semicircle is $12.5 \pi$ units $^{2}$.

(Note that we could also multiply $12.5$ by $3.14$ to get $39.25$ units $^{2}$.)

3. The answer

The area of the semicircle is $4.5 \pi$ units $^{2}$.

(Note that we could also multiply $4.5$ by $3.14$ to get $14.13$ units $^{2}$.)

4. The answer

The area of the shape is $12 \pi$ units $^{2}$.

(Note that we could also multiply 12 by $3.14$ to get $37.68$ units $^{2}$.)