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Question

The three angles of a triangle are in the ratio 1:2:3. Find the angles and classify the triangle.[3 marks]


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Solution

Given that the ratio of the angles of the triangle are 1:2:3 Let the angles be 1x, 2x, 3x respectively. [1 mark] Applying angle sum property., 1x + 2x + 3x = 180° 6x = 180° x = 180° / 6 = 30° [1 mark] Respective angles will be, 1x = 30° 2x = 2 x 30° = 60° 3x = 3 x 30 °= 90° Therefore the required angles are 30°, 60° & 90° As all the angles are different, we can say that the triangle will be the Scalene Triangle.[1 marks]

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