Question
Find distance between point A (7, 5) and B (2, 5).
$\therefore$ By distance formula,
$d(A, B)=\sqrt{\left(x_2-x_1\right)^2+\left(y_2-y_1\right)^2}$
$=\sqrt{(2-7)^2+(5-5)^2}$
$=\sqrt{(-5)^2+0^2}$
$=\sqrt{25}$
$=5 \mathrm{~cm}$
$\therefore$ The distance between points $A$ and $B$ is $5 \mathrm{~cm}$.
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