What is the distance between the points 4 5 and 10 13 on a coordinate plane?

The distance along a straight line is 10.

Using the Pythagorean equation, c2 = a2 + b2

where the x change is 6 and the y change is 8,

c2 = 62 + 82 = 36 + 64 = 100

c = [sqrt 100] = 10