Is an obtuse triangle. given that = 20, the measure of = 30°, and the measure of = 45°, which of the expressions listed would be used to find how long is? (note: for , where a, b, and c are the lengths of the sides opposite , , and , respectively, .)

the answer is su.k.my? ? co.kc

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°