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Peter has three pieces of wood. Board A is 7 inches long, board B is 14 inches long, and board C is 5 inches long. If the full length of each board is used, can the three pieces of wood be placed together to form a triangle?
A. yes, 14 - 7 > 5
B. yes, 5 + 7 < 14
C. no, 7 + 5 < 14
D. no, 14 - 5 < 7

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Answer:

C

Step-by-step explanation:

They can't form a triangle because the sum of 2 sidelengths is ALWAYS greater than the 3rd side in a triangle. Because 5+7=12<14, this means that it can't form a triangle.

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