right angle ,abuse angle
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You don't tell us enough information. In a square, there are four sides and four angles. The sides are all equal and the angles are all right angles. In a rectangle, there are four sides and four angles The opposite sides are equal and the angles are all right angles. There is no other shape in which all angles are right angles.
In a triangle ABC, they are AB, BC and CA.
False - and false ! Not ALL angles are right-angles - and a triangle has THREE sides !
A diagonal joining opposite angles is the principal diagonal. It may or may not bisect the angles, and that does not affect its name.
It has 4 sides and 4 angles There are four interior angles. Each equaling 90 degrees for a total of 360 degrees in all of the angles combined. In fact, quadrangle is another name for rectangle.