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Question

# Is it possible to construct a triangle with lengths of its sides as given below? Give reason for your answer. (i) 5 cm, 4 cm, 9 cm (ii) 8 cm, 7 cm, 4 cm (iii) 10 cm, 5 cm, 6 cm (iv) 2.5 cm, 5 cm, 7 cm (v) 3 cm, 4 cm, 8 cm

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Solution

## (i) No, because the sum of two sides of a triangle is not greater than the third side. 5 + 4 = 9 (ii) Yes, because the sum of two sides of a triangle is greater than the third side. 7 + 4 > 8; 8 + 7 > 4; 8 + 4 > 7 (iii) Yes, because the sum of two sides of a triangle is greater than the third side. 5 + 6 > 10; 10 + 6 > 5; 5 + 10 > 6 (iv) Yes, because the sum of two sides of a triangle is greater than the third side. 2.5 + 5 > 7; 5 + 7 > 2.5; 2.5 + 7 > 5 (v) No, because the sum of two sides of a triangle is not greater than the third side. 3 + 4 < 8

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