Prove that a line that divides two sides of a triangle proportionally is parallel to the third side. Be sure to create and name the appropriate geometric figures.

Question

anonymous · Answer

@sarahjoy28 @Everly @mathstudent55 @MAEMAEHOCKEY @kaioken360 @ash_heather1 @WatermelonHelper

anonymous · Answer

i will fan!!!!

anonymous · Answer

@sighdiana @caroline1218 @Ebayminer126

anonymous · Answer

@DanJS

anonymous · Answer

@Study312

ebayminer126 · Answer

Do you have a picture of the question just saying. :/

anonymous · Answer

nope no picture :( @Ebayminer126

ebayminer126 · Answer

Ok let me think about this.

anonymous · Answer

ok i just need it done in the next 45 minutes thank you i really dont understand @Ebayminer126

tkhunny · Answer

Mark all the proportional pieces and think about similarity.  You'll see it.

anonymous · Answer

There is no figure though @tkhunny

tkhunny · Answer

So?  Draw one!  It's a general theorem.  Any triangle will do.  Go!

anonymous · Answer

how would a bisecting line be parallel to the line it intersects with? @tkhunny

ebayminer126 · Answer

http://www.algebra.com/algebra/homework/Parallelograms/Three-parallel-lines-cut-off-proportional-segments-in-any-two-transverse-lines.lesson

tkhunny · Answer

Who said anything about bisecting?  That would be a special case, but that's not what we're doing.  Just draw what it says.|dw:1454622897648:dw|

anonymous · Answer

OH!  thank you! @tkhunny

tkhunny · Answer

If a = b, it's bisection.

ebayminer126 · Answer

@tkhunny will you help me with some math?