Using ruler and compass only, draw a right angle.

Answer:

Step by Step Explanation:

Draw a ray $OA$ .
With $O$ as the center and any convenient radius, draw an arc, cutting $OA$ at $P$ .
With $P$ as the center and the same radius, draw an arc, cutting the arc drawn in step 2 at $Q$ .
With $Q$ as the center and the same radius, draw an arc, cutting the arc drawn in step 2 at $R$ .
With $Q$ as the center and the same radius, draw an arc.
With $R$ as the center and the same radius, draw an arc, cutting the arc drawn in the previous step at $B$ .
Draw $OB$ and produce it to $C$ . $\angle AOC$ is the angle of measure $90^\circ$ .

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