A=(1,4) B=(0, -9) C=(7,2) D=(6,9) Prove that angles DAB and DCB are the same size. (I think you use the sideside,side theory but Im not sure please help:/)

Question

amistre64 · Answer

you have 4 points, so its not a triangle ....

amistre64 · Answer

D6 9




            A1 4

                                                          C7  2


                                  
B0 -9

amistre64 · Answer

if the midpoint from D to B is the same as the midpoint from A to C;  then opposite angles should be equal right?|dw:1382032410930:dw|
i spose you might have to consider what angles are being asked for.

do you know dot products and vectors?