The ratio of the sides of a triangle are 3:5:7 and its perimetre is 45 cm. What are the length of the sides?

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Solution

sides of the triangle 3x, 5x, and 7x, where x is the scaling factor that will bring the total up to 45.

Then, simply add and solve for x:
3x+5x+7x=45
15x=45
x=3

so lenth of sides are 3x,5x,7x
=9,15,21..

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