NECO 2023 · Paper 1 · Q26

Find the distance between the points $(2, 3)$ and $(-1, 7)$ .

Worked solution (try it first)

Find the differences: $x$ changes by $-1 - 2 = -3$ and $y$ by $7 - 3 = 4$ .
By Pythagoras, the distance is $\sqrt{(-3)^2 + 4^2} = \sqrt{25}$ , which is 5, option C.