HELP HELP HELP HELP HELP ! PLEASE PLEASE ...

Question

anonymous · Answer

attachment

loser66 · Answer

I don't know how to prove because it is trivial, D is midpoint of AC, E is mid point of BC , do DE//AB

anonymous · Answer

@Loser66  yeah i dont get it !

anonymous · Answer

You could find the equation of line segments DE and AB using the points given and prove that both have the same slopes

loser66 · Answer

that is the theorem of midpoint in triangle.

loser66 · Answer

http://users.humboldt.edu/flashman/mdptthrm.html

anonymous · Answer

@PhysicsGuru  more explanation please ? @Loser66 i need to prove that DE is parallel to AB can you tell me how to do that ?

anonymous · Answer

The way I see it is to find the slope using the slope equation for DE  and AB

you will have a system of two equations and you are looking for them to be similar so slope of DE = slope of AB

anonymous · Answer

Right !

anonymous · Answer

once slope of DE = slope of AB then they will be parallel lines because that is the condition

anonymous · Answer

and how do i find the SLOPE ?

anonymous · Answer

equation for the slope

$$m = \frac{y_2 - y_1}{x_2 - x_1}$$

where the inputs are two end points (x1,y1) and (x2,y2)

anonymous · Answer

http://users.humboldt.edu/flashman/mdptthrm.html is this explanation right ?