geometry
posted by Ryan .
m angle R=130 and m angle S=80. Find m angle T. The diagram is not to scale. Hint: draw the diagonals and use propertied of triangles.
I totally don't understand this one

I don't either. Evidently you are not describing a triangle, since you mention diagonals.
So, please fill us in on the rest of the pertinent data, and maybe you can get some help.