"Dimensions of a rectangle" means what is the "width and length" of the rectangle.
I would draw the "X" made by the two diagonals.
Try to make the left and right angles 120 degrees
and the top and bottom angles 60 degrees, since they said 60.
120 + 60 is 180, that's why.
Then draw the rectangle around the X.
Now you see isosolese triangles, so to make them right triangles,
draw a big plus sign right through the X.
Now you have eight right triangles, all of them 30/60/90 triangles, I think.