Disc shaped.
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A smoothed brick,a book, a matchbox, a CD jewel case.
When two lines cross and make a 90 degree angle. Think of the shape of a capital T now think of the left side with an, A. in the middle a, B and the right side with a, C and the top of the upside down T with an A The segment AB is perpendicular to the segment CD Because the two angles it created is 90 degrees.
CD's have a diameter of 5.5 centimeters;)
If the lines AB and CD are parallel then they both will have the same slope of -8 but with different y intercepts
when angle abc and abd equalls to 90 degree then ab perpendicular to cd