ABCD is a parallelogram. Angle DAB = 112°. Find angle ABC.
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Worked Solution
Step 1: In a parallelogram, co-interior (same-side interior) angles between two parallel sides are supplementary — they add up to 180°.
Step 2: Angle DAB and angle ABC are co-interior angles (AB is the transversal cutting the parallel sides AD and BC).
Step 3: Angle ABC = 180° − 112° = 68°.
Answer: 68°
Correct answer: 68°
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