With your compass, copy angle def to create angle abc.

Use the arrow on the top of Compass and align it with one of DEF's lines. It would be easiest to align N (North) with the arrow. Then using the little tick marks, note where the other line of DEF aligns. Then use the same spot to create ABC by drawing a straight line, mark a point you want to measure off of, put that dot in the middle of the compass where the arrow of the compass rotates, put a dot by the tick you noted, then use a ruler or the edge of a rectangle compass to make a straight line.

Hmmm i had this before , give me a sec

Can you provide the tape diagram?