Use the drawing in whichACintersectsDB

at pointOto answer the question.

Two lines intersect at pointOto form four angles.

• LineACgoes from pointAin the top left, through pointOin the center, to pointCin the bottom right.
• LineDBgoes from pointDin the bottom left, throughOon lineAC,to pointBin the top right.
• The angle at the bottom,COD,is labeled 1.
• The angle on the left,DOA,is labeled 2.
• The angle at the top,AOB,is labeled 3.
• The angle on the right,BOC,is labeled 4.

If m2 =42, find m1, m3, and m4 in degrees.