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nevsk [136]
2 years ago
7

Find the area of a semi circle with a diameter of 28cm

Mathematics
1 answer:
Alexandra [31]2 years ago
8 0

since it has a diameter of 28, then its radius must be half that or 14.

\textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=14 \end{cases}\implies A=\pi (14)^2\implies A=196\pi ~\hfill \stackrel{\stackrel{semi-circle}{half~that}}{98\pi }

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Step-by-step explanation:

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Cross multiplying, it becomes

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Subtracting 60 from left hand side and the right hand side of the equation, it becomes

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Dividing the left hand side and the right hand side of the equation by 6, it becomes

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