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1600 (square of 40)
An infinite number of ways. Cut along a line from anywhere on a side to the centre of the square. Make three more cuts, at 90, 180 and 270 degrees to the first at the centre. Each point on a side of the square will give rise to a different set of four identical pieces of the square. And there are an infinite number of points on the side of the square. So an infinite number of answers to the question.
All quadrilateral have four angles. It is possible that all four angles are right angles, even if the quadrilateral is not a square (this would be a rectangle).
square ?
The primary difference between a square and a triangle is the number of sides each has. The square has four while the triangle has three. Let's look a bit further.The triangle has no restrictions on its shape; its a three-sided figure with line segments connected together. The square on the other hand has four sides of equal length. This will also mean it has four right angles in its interior. A square is a special case of a rectangle, which is a special case of a quadrilateral. Lastly, the term quadrilateral is the general term for a four-sided figure.