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{{ printedBook.courseTrack.name }} {{ printedBook.name }} First we draw an arc with center at point $P$ that intersects $ℓ$ at two points, $A$ and $B.$

Next, we will draw two intersecting arcs. The arcs will have the same radius and one has its center in $A$ and the other its center in $B.$

Finally, we draw a line through $P$ and $Q.$

The line we just drew is perpendicular to line $ℓ.$