A square has four right angles.
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A square and a rectangle
the Letter L, a Square, and some types of Guns :D
Squares' sides are made up of 90 degree, or right angles. These angles are also acute (acute angles equaling ninety degrees or less). All angles in a square are equal, and they add up to 360 degrees.
Not always. A parallelogram only has to have two equal parallel sides and its angles does not have to be 90°. Only two types of parallelogram, the rectangle and the square, have four right angles.
A rectangle and a square are two types of quadrilaterals having four equal angles, where each of them equals a right angle.