# The perimeter of the triangle is 80 cm. One side is 27 cm and the other is 7 cm longer than

The perimeter of the triangle is 80 cm. One side is 27 cm and the other is 7 cm longer than the first. Find the length of the third side.

1) Find the length of the second side of the triangle. If it is 7 cm longer, then you need to add 7 cm.

27 + 7 = 34 (cm)

2) Find the sum of the lengths of the first and second sides of the triangle.

34 + 27 = 61 (cm)

3) Find the length of the third side of the triangle. We know the perimeter of the triangle, and the perimeter is the sum of the lengths of the three sides of the triangle. To find the length of the third side, subtract the sum of the lengths of the first and second sides from the perimeter.

80 – 61 = 19 (cm)

Answer. The length of the third side of the triangle is 19 cm.

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