16. BRIDGES A bridge truss is shown in the diagram below, where AC ∥ BD and B is the midpoint of AC. What method can be used to prove that ∆ABD ≅ ∆CBD?
Determine whether ∆PQR ≅ ∆XYZ.
17. P(3, −5), Q(11, 0), R(1, 6), X(5, 1), Y(13, 6), Z(3, 12)
18. P(−3, −3), Q(−5, 1), R(−2, 6), X(2, −6), Y(3, 3), Z(5, −1)
19. P(8, 1), Q(−7, −15), R(9, −8), X(5, 11), Y(−10, −5), Z(6, 4)
20. Write a two-column proof.
Given: ∆LMN is isosceles with LM ≅ NM, and MO bisects ∠LMN.
Prove: ∆MLO ≅ ∆MNO