Question

help please:

prove that a line that divides two sides of a triangle proportionally is parallel to the third side.

Answer 1

@ganeshie8

Answer 2

@Jack1 can you help?

Answer 3

sure, a line that divides two sides of a triangle proportionally is parallel to the third side because it would share 3 angles... so it would of course be proportional... does that make sense?

Answer 4

as the 2 "base" lines are parallel, angle y = angle b; and angle z = angle c, QED: the triangles are proportional

Answer 5

thanks so much

Answer 6

sçool, welcomes ;)