Answer:
A = Πr²
1. A = 3.14 × 4²
A = 3.14 × 16
A = 50.24
2. A = 3.14 × 3²
A = 3.14 × 9
A = 28.26
3. A = 3.14 × 5²
A = 3.14 × 25
A = 78.5
4. A = 3.14 × 4.5²
A = 3.14 × 20.25
A = 63.585
5. A = 3.14 × 7²
A = 3.14 × 49
A = 153.86
6. A = 3.14 × 2²
A = 3.14 × 4
A = 12.56
7. A = 3.14 × 2.5²
A = 3.14 × 6.25
A = 19.625
8. A = 3.14 × 3²
