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Problem 16 - Entrance Test

In a triangle, the length of the two sides are 5 cm and 7 cm. The length of the third side must be less than the sum of these two sides and greater than their difference. What are the possible lengths for the third side?

Correct: B

The sum of the lengths of the two given sides is 5 + 7 = 12 cm, and their difference is 7 - 5 = 2 cm. So, the third side must be greater than 2 cm and less than 12 cm.