SOLUTION: The lengths of the sides of a triangle are in the extended ratio 4 : 9 : 10. The perimeter of the triangle is 69 cm. What are the lengths of the sides?
Then the side lengths are 4x, 9x and 10x.
For the perimeter, you have this equation
4x + 9x + 10x = 69, or
23x = 69,
x = 69/23 = 3 cm.
Hence, the sides are 4*3 = 12 cm, 9*3 = 27 cm and 10*3 = 30 cm. ANSWER