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Question

If the angles of a triangle are in the ratio 1 : 2 : 3, determine three angles.

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Solution

If the angles of a triangle are in ratio 1:2:3, then let us take the first angle to be x.Which means that the second angle will be 2x and the third angle will be 3x.Sum of all the three angles of a triangle = 180° x + 2x + 3x = 180° 6x = 180° x = 180°6 x = 30° 2x = 2 × 30° = 60°3x = 3 × 30° = 90°Therefore, the first angle is equal to 30°, the second angle is equal to 60°, and the third angle is equal to 90°.

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