When the points are on same line, calculating distance between them is simple. You just need to count the number of units between the points.
Although, not covered by this skill builder, when two points forms a slope, you will learn something called Pythagorean Theorem,
a
2
+
b
2
=
c
2
is based on a right triangle where a and b are the lengths of the legs adjacent to the right angle, and c is the length of the hypotenuse.
You will get to know more about Pythagorean Theorem soon.