pmlucey pmlucey

15-04-2019
Mathematics

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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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crisforp crisforp

15-04-2019

Answer:

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.

Step-by-step explanation:

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