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Perimeter and Area of Composite Figures

Perimeter and Area of Composite Figures

TGM Original Questions
  1. The figure below shows a ring that consists of two concentric circles. Find the area of the shaded region.
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  1. The figure below shows a half of a ring that consists of two concentric circles. Find the perimeter and the area of the shaded region.
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Answer:(i) \(113\text{ cm}^2\) (ii) perimeter \(=43.7\text{ cm}\), area \(=18\pi\text{ cm}^2\) (or \(56.5\text{ cm}^2\))

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