Two supporting reasons are missing from the proof. Complete the proof by dragging and dropping the appropriate reasons into each of the empty boxes. Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse. Given: m∥nm∠3=120° Prove: m∠8=60° The figure shows what appear to be parallel lines n and m rising from left to right with line m above line n. Line p rises slightly from left to right first intersecting line n, then line m. The angles formed by the intersection of lines p and m are numbered from 1 through 4 in a clockwise direction starting with angle 1 which is located above line m and to the left of line p. The angles formed by the intersection of lines p and n are numbered 5 through 8 in a clockwise direction with angle 5 above line n and to the left of line p. Statements Reasons ​m∥nm∠3=120°​ Given ∠5≅∠3 Response area m∠5=m∠3 Angle Congruence Postulate m∠5=120° Substitution Property of Equality m∠8+m∠5=180° Linear Pair Postulate m∠8+120°=180° Response area ​m∠8=60°​ Subtraction Property of Equality Skip to navigation