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Home > GC > Chapter 9 > Lesson 9.1.5 > Problem 9-51


A triangle where the base is 30, x, minus 4. An internal line parallel to the base and bisecting the other two side has a length, 12, x, Plus 7.Write and solve an equation based on the geometric relationship shown at right.  

Although you do not have dimensions, you can write an equation by examining the relationship between the side lengths.

, so .