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Mathematics for IGCSE & O level - Angles (Section 3 - No. 38)

In a triangle, the angles are in the ratio 2:3:4. What is the largest angle?
40°
60°
80°
120°

解释

2x + 3x + 4x = 180; 9x = 180; x = 20. 4x = 80°.

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