The perimeter of the triangle is 63 cm, the aspect ratio is 5: 7: 9. Find the length of the sides of the triangle.

Perimeter is the sum of the lengths of all sides.
Let one part be equal to x; then 1 side is 5x; 7x and 9x
63 = 5x + 7x + 9x
63 = 21x
X = 3
Then the sides are equal, respectively:
3 * 5 = 15
3 * 7 = 21
3 * 9 = 27



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.