A rectangle or a square: both have four sides and a right-angle of 90 degrees forming the four corners.
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A square and a rectangle.
square
Apart from both being a geometric 2D shape, there is little similarity between the two. A rectangle has four parallel sides and a right-angle in each of the four corners. A right-angle triangle has three sides and only a right-angle in one corner.
A rectangle has four sides whereas a right angle triangle has only three sides.
An example is an A4 sheet of paper. There is a right-angle in each corner, 4 right-angle in total. So, basically, an angle in a shape is a change of direction.