# One of the angles

Let, the other two angles = 4x and 5x

The biggest angle = 4x + 5x = 9x

According to problem,

4x + 5x + 9x = 180

18x = 180

x = 10

The angles of the triangle,

4x = 4 × 10° = 40°

5x = 5 × 10° = 50°

9x = 9 × 10° = 90°

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