I Need to know the Formula. You'll See the attachment. I need to know Please!!

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- February 11th 2007, 04:11 PMNeedHelpMathProblemSolve sides in triangle
I Need to know the Formula. You'll See the attachment. I need to know Please!!

- February 11th 2007, 04:20 PMtopsquark
See the two lines cutting the sides of the triangle? Connect them. Then the whole triangle will be similar to the little triangle on the top. So the sides are in proportionate measure to each other. Call the unknown distance x.

Thus:

(15 + 10)/15 = (9 + x)/9

25/15 = (9 + x)/9

5/3 = (9 + x)/9

9*5/3 = 9 + x

15 = 9 + x

x = 15 - 9 = 6 m.

-Dan