### To Reproduce and angle

Given an angle with vertex at A

Step 1. Scribe an arc centered at A and intersecting the arms of
the angle at B and C.

Step 2. On the other line, scribe and arc of the same radius
centered at A' intersecting the line at B'

Step 3. Use the compass to measure the distance from B to C, and
with the compass centered at B' scribe an arc whose radius is the
distance from B to C intersecting the arc from Step 2 at C'.

Step 4. Draw the line from A' through C'.

Proof

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