If the circumference of a circle is 18π cm, then the area of the circ

1.	If the circumference of a circle is 18π cm, then the area of the circle isA. 18π square cmB. 18π2 square cmC. 81π square cmD. 9π square cm1. A2. D3. B4. C
Answer» Correct Answer - Option 4 : C Given: Circumference of circle = 18π cm Formula used: Circumference of circle = 2πr Area of circle = πr² Calculation: Circumference of circle = 2πr ⇒ 18π = 2πr ⇒ r = 9 cm Area of circle = πr² ⇒ Area = 9² × π ⇒ Area = 81π sq. cm ∴ The area of circle is 81π square cm.

If the circumference of a circle is 18π cm, then the area of the circle isA. 18π square cmB. 18π2 square cmC. 81π square cmD. 9π square cm1. A2. D3. B4. C

Answer» Correct Answer - Option 4 : C

Given:

Circumference of circle = 18π cm

Formula used:

Circumference of circle = 2πr

Area of circle = πr²

Calculation:

Circumference of circle = 2πr

⇒ 18π = 2πr

⇒ r = 9 cm

Area of circle = πr²

⇒ Area = 9² × π

⇒ Area = 81π sq. cm

∴ The area of circle is 81π square cm.

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If the circumference of a circle is 18π cm, then the area of the circle isA. 18π square cmB. 18π2 square cmC. 81π square cmD. 9π square cm1. A2. D3. B4. C

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