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3. What is the area of a circle with a radius of 5 cm? A=

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Area of a circle

We know that the area of a circle can be calculated using the following formula:

Area = π r²

where r: radius

Replacing r = 5 cm, we have:


\begin{gathered} \pi r^2=\pi(5cm)^2 \\ Area=\pi\cdot25cm^2 \\ Area=25\pi cm^2\cong78.54\operatorname{cm}^2 \end{gathered}

Answer: A = 25π cm² ≅ 78.54 cm²

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