Circles, SM-Bank 054

Given the earths' radius is approximately 6400 kilometres, calculate the distance, \(d\), around the earth at the equator. Give your answer correct to the nearest whole kilometre. (2 marks)

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\(40\ 212\ \text{km (nearest whole kilometre)}\)

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\(d\)	\(=2\pi r\)
	\(=2\pi \times 6400\)
	\(=40\ 212.3859\dots\)
	\(=40\ 212\ \text{km (nearest whole kilometre)}\)

\(\therefore\ \text{The distance around the earth at the equator is approximately }40\ 212\ \text{kilometres.}\)