Exercise 8 Page 524

Using a compass, we first draw an arc with center at point $P$ that intersects $m$ at two points, $A$ and $B.$

Next, we will draw an intersecting arc with center $A.$ Using the same radius, we draw another arc with center $B$ and label the intersection of the arcs $Q.$

Finally, we draw a line through $P$ and $Q.$ This line will be perpendicular to line $m.$