Question

A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18π meters.

What is the area A of the cross section of the column?

Pls help

Answer 1

Answer:

What is the area A of the cross section of the column?

A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18π meters.

Give your answer in terms of pi

Step-by-step explanation:

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Answer 2

Answer:

254.34 or 81π (They are the same)

Step-by-step explanation:

We need to solve for the diameter.

Circumference = 3.14 × 18π

18π = π × diameter

18 = diameter

The radius is half of the diameter, so the radius is 9 (18 ÷ 2 = 9). Now, you can use 9 in the equation:

Area = π × (9 × 9)

Area = 3.14 × 81

Area = 254.34 (also the same as 81π)