Composite Figures, SM-Bank 014

Pedro cuts a sector from a circle so that \(\dfrac{3}{8}\) of the area of the circle remains.

If the circles' radius is 5 cm, what is the perimeter of the shape, to the nearest centimetre? (2 marks)

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\(22\ \text{cm}\)

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\(\text{Perimeter}\)	\(=\dfrac{3}{8}\times 2 \pi r + 2 r\)
	\(=\dfrac{3}{8}\times 2 \pi \times 5 + 10\)
	\(= 21.78\dots\)
	\(= 22\ \text{cm (nearest cm)}\)