During a P4 geometry lesson at Tampines Primary, Mr Lim asks his pupils to identify an obtuse angle. Which of these angles is obtuse?
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Worked Solution
Step 1: Recall the definition. An obtuse angle is greater than 90° AND less than 180°.\n
Step 2: Check each option against the rule: 130° → between 90° and 180° → obtuse ✓; 75° → less than 90° → acute; 90° → exactly 90° → right angle; 180° → straight angle.\n
Step 3: Only 130° fits the definition of obtuse.
Answer: 130°
Correct answer: 130°
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