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what is a triangle proportionality

don't understand the difference between triangle proportionality and midsegment. can you please explain to me in a better way than the inturnet does :)

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Steve S. | Tutoring in Precalculus, Trig, and Differential CalculusTutoring in Precalculus, Trig, and Diffe...
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If two triangles have the same shape but different sizes (i.e., are similar), their corresponding sides are proportional.
 
If ΔABC ~ ΔDEF, then AB/BC = DE/EF; or CA/FD = BA/ED; etc.
 
A midsegment creates a smaller but similar triangle inside the original triangle. Each side of the smaller triangle is 1/2 the length of the corresponding side in the larger triangle.