In her backyard, Mrs. Wilson set up an area for the kids to run races. The race area was 15 yards across. Mrs. Wilson put cones every ½ yard to mark the location. How many cones did she place in her backyard?

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.