In a triangle, one angle is twice another, and the third angle is 60°. Find the largest angle.
- A.70°
- B.75°
- C.80° ✓
- D.85°
Explanation: The other two angles sum to 120°. If they're x and 2x, then 3x=120, x=40, so the largest is 2x=80°.
Class 6 IMO Mathematics Olympiad practice · Geometry & Spatial Thinking · Lines & Angles
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