PQRS is a rhombus. ∠PQR is 110°. Find ∠QRS.
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Worked Solution
In a rhombus, opposite sides are parallel.
This means interior adjacent angles between parallel lines add up to 180°.
∠PQR + ∠QRS = 180°.
110° + ∠QRS = 180°.
∠QRS = 180° - 110° = 70°.
Key formula: Adjacent angles in a rhombus sum to 180°.
Answer: 70°
Correct answer: 70°
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