A triangle has a perimeter of 40 centimeters. Two sides are 12 and 15 centimeters. How long is the third side?
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- Subtract the known sides from the perimeter.
- Calculate 40 − 12 − 15.
Show the answer and solution
Answer: 13
The known sides total 12 + 15 = 27. The third side is 40 − 27 = 13 centimeters.