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

someone plzz help

dangerousjesse · Answer

Because in order for them to be cut proportionally, all sides of the cutting line must be parallel to the third line.|dw:1409870618372:dw|

anonymous · Answer

srry i dont understand

dangerousjesse · Answer

Do you know what exactly a parallel line is?

anonymous · Answer

yes its two lines next too each other and will never intersect

dangerousjesse · Answer

Yes, and for the previous statement to be true, the triangle would have to be an isosceles triangle, which has two equal sides :)

anonymous · Answer

ok thnx alot