1. Since the lengths of the sides of the triangle are 7: 5: 3, we will designate them as “7X”, “5X” and “3X”.
The perimeter of a triangle is equal to the sum of the lengths of its sides. Let’s compose and solve the equation if the perimeter of the triangle is 75 cm:
7X + 5X + 3X = 75;
15X = 75;
X = 75/15;
X = 5.
2. Find the sides of the triangle:
7 * 5 = 35 (cm);
5 * 5 = 25 (cm);
3 * 5 = 15 (cm).
Answer: the sides of the triangle are 35 cm, 25 cm and 15 cm.
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