Question

NEED HELP ASAP 20 POINTS GIVEN

The measure of ∠DAB equals 110º. The measure of ∠ACB equals 20º.What is m∠ABC?
 
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Answer 1

The answer is 90º

Proof:

Answer 2

The first step is always to make an illustration of the problem. My understanding of the problem is shown in the attached picture. To make the problem easier to solve, I assumes that points C, A and D are collinear. Because if it isn't we can't find any relations that can solve the problem.

∠DAB and ∠CAB are supplementary angles. So,
∠CAB = 180 - 110 = 70°

Since a triangle has 180° altogether,
x = ∠ABC = 180 - 70 - 20 = 90°