ABCD is a parallelogram. ∠DAB = 65°. Find ∠ABC.
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Worked Solution
In a parallelogram, opposite sides are parallel. So AD is parallel to BC.
The adjacent angles in a parallelogram between parallel lines add up to 180°.
∠ABC + ∠DAB = 180°.
∠ABC = 180° - 65° = 115°.
Key formula: Adjacent angles in a parallelogram sum to 180°.
Answer: 115°
Correct answer: 115°
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