Verified answer

1.) R = D÷2 A = πr²

R = 30÷2 A = 3.14 × 15²

R = 15cm A = 3.14 × 225

A = 706.5cm²

Answer: The area of the circle is 706.5cm².

2.) A = πr²

A = 3.14 × 5²

A = 3.14 × 25

A = 78.5m²

Answer: The area of the circle is 78.5m².

3.) R = D÷2 A = πr²

R = 8.6 ÷ 2 A = 3.14 × 4.3²

R = 4.3cm² A = 3.14 × 13.502

A = 42.39628cm²

Answer: The area of the circle is 42.39628cm².

Hope it helps!