On a straight road marker outside Bishan MRT, three rays from a single point divide the straight edge into three angles of 65°, 48°, and ∠b. Find the size of ∠b.
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Worked Solution
Step 1: Recall the rule — angles on a straight line add up to 180°.
Step 2: Write the equation: 65° + 48° + ∠b = 180°.
Step 3: Add the two known angles: 65° + 48° = 113°. Then ∠b = 180° − 113° = 67°.
Final answer: ∠b = 67°.
Answer: 67°
Correct answer: 67°
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