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Question

The measures of angles of a triangle are in the ratio 1 : 2 : 3. Determine the measures of each angle of the triangle.

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Solution

Let the common multiple of the given ratio be x.Let the measure of the Ist angle, the IInd angle and the IIIrd angle be x°, (2x)° and (3x)°, respectively.We know that the sum of all angles of a triangle is 180°.Thus, we have:x+2x+3x=1806x=180x=30Measure of the Ist angle=30°Measure of the IInd angle =2×30°=60°Measure of the IIIrd angle = 3×30°=90°

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