4MA1/1FR Jun 2020, Question 27: Interior and Exterior Angles of Polygons
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1FR (Foundation) · Calculator · 3 marks
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The question, in short
For a regular octagon ABCDEFGH with diagonal AC drawn, calculate the size of angle HAC.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1360 ÷ 8 = 45
- 2180 − 45 = 135
- 3(180 − 135) ÷ 2 = 22.5
- 4135 − 22.5 = 112.5
Answer112.5
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