A square, rectangle, rhombus (I think)
There's a couple ways to do this. These look like special triangles to me. Which should be the 30 60 90 triangle's which have the same ratios for their legs. The legs will always be square root three and one and the hypotenuse of two - I can't see what I'm typing for some reason so I will finish in a comment
B
Its because when you rearrange using this formula y=mx+c, where m is slope, if m is negative then that line has a negative slope
