Question

Difficulty: EasyCircular Area and Circumference Applications

A circular water pipe has a diameter of $8$ inches. What is the cross-sectional area of the pipe? Use $\pi = 3.14$ .

Answer: 50.24 square inches

50.24 square inches

The area of a circle is calculated using the formula

A = \pi r^2

. First, find the radius by dividing the diameter by 2 (

8 \div 2 = 4

). Then, substitute

r = 4

and

\pi = 3.14

into the formula:

A = 3.14 \times 4^2 = 3.14 \times 16 = 50.24

Find the radius of the pipe.

Radius = 4 inches

The formula for the area of a circle requires the radius, which is exactly half of the diameter.

Calculate the cross-sectional area using the area formula.

Area = 50.24 square inches

Squaring the radius (16) and multiplying by 3.14 gives the total area of the circle.

Calculating the area of a circle given its diameter.

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