Let's read the story, then frame equations and solve them : The three angles of a triangle are x°, 2x° and 3x° , let us find the measure of the greatest angle .
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We know that sums of a triangle is 180
x + 2x + 3x =180
6x = 180
x = 30
thus the greatest angle is 3x = 3*30 = 90
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