I don't know the answer to this question. This is the answer to Unit 2: multiple-choice question: DCBDCDCBBC fill in the blanks: 1 1. 12.95 。 13. 15 equals the vertex angle. 14.66 48 。 15.∠CGF, the congruence angle is equal, two lines are parallel, ∠F, the internal dislocation angle is equal, two lines are parallel, ∠F, two lines are parallel, and the internal angles are complementary to each other. 16.54 。