1. A = πr²
= 3.14 × ( 7 × 7 )
= 3.14 × 49
= 153.86 cm²
2. A = πr²
= 3.14 × ( [ 19 ÷ 2 ] × [ 19 ÷ 2 ] )
= 3.14 × ( 9.5 × 9.5 )
= 3.14 × 90.25
= 283.385 cm²
3. A = πr²
= 3.14 × ( 12 × 12 )
= 3.14 × 144
= 452.16 m²
4. A = πr²
= 3.14 × ( 25 × 25 )
= 3.14 × 625
= 1962.5 dm²
5. A = πr²
= 3.14 × ( [ 21 ÷ 2 ] × [ 21 ÷ 2] )
= 3.14 × ( 10.5 × 10.5 )
= 3.14 × 110.25
= 346.185 cm²
I hope this helps... Please correct my answers if it is wrong.
Copyright © 2024 EHUB.TIPS team's - All rights reserved.
Answers & Comments
1. A = πr²
= 3.14 × ( 7 × 7 )
= 3.14 × 49
= 153.86 cm²
2. A = πr²
= 3.14 × ( [ 19 ÷ 2 ] × [ 19 ÷ 2 ] )
= 3.14 × ( 9.5 × 9.5 )
= 3.14 × 90.25
= 283.385 cm²
3. A = πr²
= 3.14 × ( 12 × 12 )
= 3.14 × 144
= 452.16 m²
4. A = πr²
= 3.14 × ( 25 × 25 )
= 3.14 × 625
= 1962.5 dm²
5. A = πr²
= 3.14 × ( [ 21 ÷ 2 ] × [ 21 ÷ 2] )
= 3.14 × ( 10.5 × 10.5 )
= 3.14 × 110.25
= 346.185 cm²
I hope this helps... Please correct my answers if it is wrong.