They are all 90
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Ninety degrees.
A rectangle, by definition, has four right angles, each measuring 90 degrees. If a rectangle were to have "no angle," it would not meet the criteria of being a rectangle. Additionally, if "same size" refers to equal dimensions, a rectangle maintains its properties regardless of size, as long as it retains its shape with right angles. Therefore, a rectangle cannot exist without angles.
A rectangle. If the sides are the same size, it's a square.
They can, but usually they are not. All the angles will be equal only if your parallelogram is a rectangle.
All four angles in a rectangle are 90 degrees. In any quadrilateral the sum of all four angles is 360 degrees.