Yes, to be a square, it must have all 90º angles.
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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.
Right angles are ninety degree angles. That is equal to one quarter of a complete rotation.
All have 90 degree angles.
because they are all the same size or shape. Because all squares have all the same length sides and are always made up of all 90 degree angles.
No, it can't be. 'Acute' means that all the angles are under ninety degrees; therefore, a ninety degree angle would make it impossible to have an acute triangle.