Area of a Circle with Radius 9 (Answer: 254.469)

Exact Answer

A = π × 9² = 254.469

Area (πr²)

254.469 (81π)

Circumference (2πr)

56.5487 (18π)

Diameter (2r)

Radius (r)

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Step-by-Step Solution: A = π × 9² = 254.469

Step 1

Calculate the Area Using A = πr²

Square the radius (9² = 81) and multiply by π (≈ 3.14159265): 81 × π = 254.469.

A = π × 9² = 81π ≈ 254.469

Step 2

Calculate the Circumference Using C = 2πr

Multiply 2 × π × 9 = 18π ≈ 56.5487.

C = 2 × π × 9 ≈ 56.5487

Summary & Alternative Representations

Property / Format	Value
Area (πr²)	`254.469 (81π)`
Circumference (2πr)	`56.5487 (18π)`
Diameter (2r)	`18`
Radius (r)	`9`

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Frequently Asked Questions

What is the circumference of a circle with radius 9?

The circumference is 2 × π × 9 ≈ 56.5487.