Three rays leave a single point O on a Singapore Discovery Centre signpost, dividing the full turn around O into three angles of 130°, 110°, and ∠a. Find the size of ∠a.
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Worked Solution
Step 1: Recall the rule — angles at a point add up to 360°.
Step 2: Write the equation: 130° + 110° + ∠a = 360°.
Step 3: Add the two known angles: 130° + 110° = 240°. Then ∠a = 360° − 240° = 120°.
Final answer: ∠a = 120°.
Answer: 120°
Correct answer: 120°
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