At a Kallang arts class, Hakim folds a triangular piece of origami paper. Two of the angles of the triangle measure 65° and 75°. What is the size of the third angle of the triangle?
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Worked Solution
Step 1: Recall the angle sum of a triangle.
The three interior angles of any triangle add up to 180°.
Step 2: Subtract both known angles from 180°.
Third angle = 180° − 65° − 75°
= 180° − 140°
= 40°.
Step 3: Check.
65° + 75° + 40° = 180° ✓
Final answer: 40°.
Answer: 40°
Correct answer: 40°
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