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10-06-2014
Mathematics

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'Work out the length of the line segment PQ.
Give your answer correct to 3 significant figures.'

Work out the length of the line segment PQ Give your answer correct to 3 significant figures class=

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10-06-2014

The length is:

the square root of [ (the difference in 'x' values)² + (the difference in 'y' values)² ]

D = √ [ (-2-6)² + (5-2)² ]

= √ [ (-8)² + (3)² ]

= √ (64 + 9) = √75 = 5√3 = 8.66 (rounded to 3 sig-figs)

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