It is a 4 sided quadrilateral shape having 2 pairs of parallel sides and 4 interior angles of 90 degrees as well as 2 diagonals
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The definition of congruent is...Figures that have the same size and shape.
A rectangle is not a trapezoid. A trapezoid is defined as a quadrilateral with one pair of parallel sides and another pair that is not parallel. That description cannot be applied to a rectangle. It is only if you define a trapezoid as a quadrilateral with one pair of parallel sides and say nothing at all about the other sides, can a rectangle be said to be a trapezoid. But you would have to be mathematically incompetent to use that as a definition of a trapezoid.
Coplanar means "on the same plane". A plane can be a figure or shape like a rectangle. Coplanar points means points that belong on the same plane.
Rectangle area = (rectangle width) x (rectangle height)
A = lw Area of a rectangle = length times width