The angles of a triangle are in the ratio 2:3:5. Find the largest angle.
A36°
B54°
C90°CORRECT
D108°
GCEMathematicsPlane Geometry2021
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Why the answer is C, and why the others tempt you.
The sum of angles in a triangle is 180°. The ratio 2:3:5 has a total of 10 parts. Each part equals 180°/10 = 18°. The largest angle corresponds to 5 parts: 5 × 18° = 90°.
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