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Sagot :

Answer:

Formula: A = πr²

1. A = (3.14)(7m)²

= (3.14)(49m²)

A = 153.86m²

2. A = (3.14)(10in)²

= (3.14)(100in²)

A = 314in²

3. A = (3.14)(100cm)²

= (3.14)(10,000cm²)

A = 31,400cm²

4. A = (3.14)(50cm)²

= (3.14)(2,500cm²)

A = 7,850cm²

Formula: A = 1/4πd²

5. A = 1/4(3.14)(18m)²

= 1/4(3.14)(324m²)

= 1/4(1,017.36m²)

= 1,017.36m²/4

A = 254.34m²

6. A = 1/4(3.14)(73cm)²

= 1/4(3.14)(5,329cm²)

= 1/4(16,733.06cm²)

= 16,733.06cm²/4

A = 4,183.27m²

7. A = 1/4(3.14)(25cm)²

= 1/4(3.14)(625cm²)

= 1/4(1,962.5cm²)

= 1,962.5cm²/4

A = 490.63cm²

8. A = 1/4(3.14)(30in)²

= 1/4(3.14)(900in²)

= 1/4(2,826in²)

= 2,826in²/4

A = 706.5in²