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Question
In ΔPQR, ∠P = 70°, ∠Q = 65° then find ∠R.
Solution
In ΔPQR,
∠P + ∠Q + ∠R = 180° ...(The sum of all angles of a triangle is 180°.)
⇒ 70° + 65° + ∠R = 180°
⇒ 135° + ∠R = 180°
⇒ ∠R = 180° − 135°
= 45°
Hence, the measure of ∠ R is 45°.
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