Composite Figures, SM-Bank 002

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

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\(51.4\ \text{cm (1 d.p.)}\)

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\(\text{Perimeter}\)	\(=2\ \text{straight sides}+2\ \text{semi-circles}\)
	\(=2\times 10+\Bigg(2\times\dfrac{\pi \times d}{2}\Bigg)\)
	\(=20+\pi \times 10\)
	\(=51.4159\dots\)
	\(=51.4\ \text{cm (1 d.p.)}\)