Question

If two circles having centre $P$ and $Q$ touches externally each other with their radii $3$ $cm$ and $5$ $cm$, find the distance $PQ$.

Answer 1

Two circles with centres $P$ and $Q$ and radii $3$ $cm$ and $5$ $cm$ respectively touch each other externally at the point $A$.
$PQ=PA+AQ$
$=3$ $cm$ $+5$ $cm$
$=8$ $cm$