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3 October, 23:34

Which set of side lengths can be used to construct a triangle?

A. 1, 2, 3

B. 6, 9, 15

C. 7, 12, 20

D. 9, 12, 17

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Answers (1)
  1. 4 October, 02:12
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    We verify: a < b + c; b < a + c; c < a + b;

    Only a = 9, b = 12, c = 7 verify the conditions: 9 < 19; 12 < 16; 7 < 21;

    The correct answer is D.
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