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Question
In a right-angled triangle if an angle measures 35°, then find the measure of the third angle.
Solution
In a right-angled ΔABC,
∠A + ∠B + ∠C = 180° .....[Angle sum property of a triangle]
⇒ ∠A + 90° + 35° = 180° ......[∵ ∠B = 90° and ∠C = 35°, given]
⇒ ∠A + 125° = 180°
⇒ ∠A = 180° – 125° = 55°
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