Its an application of Pythagoras theorem:
distance = sqrt ( (10-4)^2 + (13-5)^2)
= sqrt ( 36 + 64)
= sqrt 100
= 10 answer
=
The distance between (4,5) and (10,13) is 10 cm on a coordinate grid.
You can mark the points and measure the distance using a scale/ruler.
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