Copying an AngleAlissa Morris4 HourHonors Geometry

Step 1

Start with angle BAC.

Step 2

Using the straightedge, draw a reference line and place a point P near the left end.

Step 3

Set the compass width to the distance AC, and without adjusting the compass, place it on P and mark an arc across the line. This establishes the point Q.

Step 4

With the compass on point A set its width to the point B.

Step 5

Without changing the compass width, place the compass point on the point P and draw an arc above the line.

Step 6

Place the compass point on C and set its width to the point B.

Step 7

Without changing the compass width, place the compass point on the point Q and draw an arc across the previously drawn arc. The intersection of these two arcs becomes point R.

Step 8

Using the straightedge, draw a line from point P to R where the arcs intersect.

Step 9

The angle QPR is congruent to the angle CAB.