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Point A and point B have been plotted on a centimetre square grid. Point A has
coordinates (2, 1) and point
B has coordinates (4,9), as shown below.
Using Pythagoras' theorem, calculate the distance from A to B.
Give your answer in centimetres (cm) to 1 d.p.



Answer :

The answer is 8.2
Since the difference in the x values for A and B is 2, that’s the length of the triangle.
The difference in the y values for A and B is 8.
Using pythagoras’ theorem (a^2+b^2=c^2), we do 2^2 + 8^2=68.
Since 68 is c^2, we root it to get the distance from A to B.
Root 68 is equal to 8.2.

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