Mathematics · May / June 2026 · Paper 43 · Question 15
0580
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The question as text
The sides of a triangle are 5 cm, 7 cm and 11 cm. Find the size of the largest angle in this triangle. [3]
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132 or 132.2 or 132.17 to 132.18 Alternative method 130 to 134 from a correct triangle [3]
Mark at most accurate.
M2 for 52 + 72 – 112 2 ×5 × 7
or M1 for 112 = 52 + 72 – 2 × 5 ×7cosx If 0 scored
SC1 for 19.7 or 19.6[8…] or 28.13 to 28.14 3 Using construction: Tolerance ± 2 mm.
B2 for a ruled triangle with all three sides within tolerance of given values
or M1 for a ruled triangle with just two sides in tolerance If 0 scored,
SC1 for measuring largest angle in Tolerance ± 2°. their scalene triangle (must be a triangle, not just e.g. 2 lines).
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