SOLUTION: 1. An isosceles triangle has a perimeter of 55 cm. Find the length of one of the equal sides if the third side is 15 cm long.

Question 64593: 1. An isosceles triangle has a perimeter of 55 cm. Find the length of one of the equal sides if the third side is 15 cm long.

Answer by 303795(602) (Show Source): You can put this solution on YOUR website!
The perimeter is found by adding the lengths of the three sides. Given that it is an isoceles triangle then two sides have the same length.
x + x + 15 = 55
Subtract 15 from each side
x + x + 15 - 15 = 55 - 15
x + x = 40
If 2x = 40 then x = 20
The triangle has side lengths of 15 cm, 20 cm and 20 cm.

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