Area of a circle = πr^2
18 inches = 9 inches (radius)
A = π×9^2
A = 81π inches^2
Or...
A = 81×π
A = 254.5 inches^2 (1 dp)
Answer:
A = 81π in²
A ≈ 254.34 in²
Step-by-step explanation:
Area of a circle is:
[tex]A = \pi r^2\\\rule{150}{0.5}\\r \text{ - radius}[/tex]
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The diameter is double the radius. T
his means that the radius is half the diameter.
18in./2 = 9in
The radius is 9 in.
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[tex]A = \pi r^2\\\rule{150}{0.5}\\A = \pi (9)^2\\\\A = \pi 81\\\\\boxed{A = 81\pi \text{ in.}^2}\\\\\textbf{or}\\\\A \approx 81 * 3.14\\\\\boxed{A \approx 254.34 \text{ in.}^2}[/tex]
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Hope this helps.
