If the coordinates of $P$ and $Q$ are $( -2,\ 0)$ and $( -2,\ 7)$, then find $PQ$?
Given: The coordinates of $P$ and $Q$ are $( -2,\ 0)$ and $( -2,\ 7)$.
To do: To find $PQ$.
Solution:
Here, $x_1=-2,\ y_1=0,\ x_2=-2,\ y_2=7$
On using the distance formula,
$PQ=\sqrt{( -2-( -2))^2+( 7-0)^2}$
$\Rightarrow PQ=\sqrt{0+49}$
$\Rightarrow PQ=\sqrt{49}$
$\Rightarrow PQ=7$
Therefore, distance $PQ=7\ unit$
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