The lengths of two sides of ABC are 15 and 20, and the triangle perimeter is 50. What is the third side of ABC?
The lengths of two sides of ABC are 15 and 20, and the triangle perimeter is 50. What is the third side of ABC?
The perimeter of a triangle is the sum of the lengths of all three sides.
You know the length of two sides; namely 15 and 20. These two sides total 35.
So the third side has to be 50 (the total perimeter) minus the other two sides.
50 – 35 = 15 the length of the third side
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