MathGeometry
posted by Emily .
Solve for X using the sidesplitting theorem for a triangle: upper left= 6x10, upper right= 5x, lower left= 4x+8, lower right=4x

set up the proportion
(6x10)/(4x+8) = 5x/(4x)
the x's on the right side will cancel, then crossmultiply, it solves very nicely
I had x = 20
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