Answer:
1. A = πr²
= 3.14 × ( 3.5 × 3.5 )
= 3.14 × 12.25
= 38.465 mm²
2. A = πr²
= 3.14 × ( [ 16 ÷ 2 ] × [ 16 ÷ 2 ] )
= 3.14 × ( 8 × 8 )
= 3.14 × 64
= 200.96 cm²
3. A = πr²
= 3.14 × ( [ 28 ÷ 2 ] × [ 28 ÷ 2 ] )
= 3.14 × ( 14 × 14 )
= 3.14 × 196
= 615.44 cm²
4. A = πr²
= 3.14 × ( 4.2 × 4.2 )
= 3.14 × 17.64
= 55.3896 mm²
5. A = πr²
= 3.14 × ( 3.8 × 3.8 )
= 3.14 × 14.44
= 45.3416 mm²
Step-by-step explanation:
I hope this helps... Please correct my answers if it is wrong.
