All have 90 degree angles.
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Rectangles and squares are the only parallelograms that contain 90 degree angles.
Rectangles are parallelograms with four 90o corners. These are known as right angles, and indeed, 'rectangle' comes from latin, 'rectus' meaning 'right' and 'angulus' meaning 'angle'. A rectangle is considered a square if the sides all have equal length. Because all squares have four right angled corners, they are all, by definition, rectangles.
The small squares are indicators that the angles are right angles, which are found in shapes such as rectangles, squares and right-angled triangles. A right angle is 90 degrees, 1 quarter of 360 degrees, a full turn, such as a circle. I hope this helps ^^
squares and rectangles
Any and all squares and rectangles. Every one of these two shapes has only right angles. Though some triangles also have right angles.