Question 550470
You need to learn to either think of those figures in your head and
draw them like this and see for yourself.

{{{drawing(400,3600/29,-9,20,0,9, 
locate(-8,1,rhombus), locate(-3,1,rectangle), locate(2,3,parallelogram),
locate(10,3,isosceles_trapezoid),
line(-6,1,-8,4),
line(-6,7,-8,4),
line(-6,7,-4,4),
line(-6,1,-4,4),
line(-6,1,-6,7),
line(-4,4,-8,4),

line(-2,1,1,1),
line(1,1,1,7),
line(1,7,-2,7),
line(-2,7,-2,1),
line(-2,1,1,7),
line(1,1,-2,7),

line(3,3,6,6),
line(6,6,12,6),
line(12,6,9,3),
line(9,3,3,3),
line(3,3,12,6),
line(6,6,9,3),

line(12,3,14,6),
line(14,6,17,6),
line(17,6,19,3),
line(19,3,12,3),
line(12,3,17,6),
line(19,3,14,6)

)}}}

Look at those angles and diagonals and decide which of them 
always, not just sometimes, fits that description.

Edwin </pre>