The perimeter of the triangle is 132 cm, and the lengths of its sides are 5: 7: 10. Find the sides of the triangle.

1. Let the side of one part be equal to x, then the perimeter of the triangle can be expressed as follows:
5x + 7x + 10x = 132,
22x = 132,
x = 132/22,
x = 6.
2. Find the sides of the triangle by multiplying the number of parts of each side by 6 cm, we get:
1 side = 5 * 6 = 30 cm.
2 side = 7 * 6 = 42 cm.
3 side = 10 * 6 = 60 cm.
Answer: the sides of the triangle are 30 cm, 42 cm and 60 cm.