Composite Figures, SM-Bank 003

Find the perimeter of the figure below correct to one decimal place. (2 marks)

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\(67.7\ \text{cm (1 d.p.)}\)

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\(\text{Perimeter}\)	\(=5\ \text{straight sides}+1\ \text{semi-circle}\)
	\(=2\times 12+20+2\times 4+\Bigg(\dfrac{\pi \times d}{2}\Bigg)\)
	\(=52+\Bigg(\dfrac{\pi \times 10}{2}\Bigg)\)
	\(=67.7079\dots\)
	\(=67.7\ \text{cm (1 d.p.)}\)