0580/23 Oct/Nov 2025, Question 1: Angles in a Triangle
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Non-calculator · 2 marks
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The question, in short
An isosceles triangle has equal sides meeting at angle x° and a base angle of 25°. Find x.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 2 marks
- 1Both base angles are 25° (isosceles triangle)
- 2x = 180 − 2 × 25 = 130
Answer130
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Also searched as: 0580/23/O/N/25 · 0580_w25_qp_23 · 0580 w25 23 · question 1.
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