ABC is an isosceles triangle with BA=BC. D lies on AC. ABD is an isosceles triangle with AB=AD. Angle ABD=172. Show that triangle BCD is isosceles. You must give a reason for each stage of working

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i can't solve unless i know what the line is

step-by-step explanation:

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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°