A right angle
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measure one side of the square then multiply by 1.414 ex. a 10 in. square will have a corner to corner length of 14.14 in.
All right angle triangles have a square corner
I think you can tell if a shape has a square corner by seeing if the corner has a 90 degree angle. If it is 90 degress than it is a square corner.
A good move in four square, that is to get a player out, is to do a corner hit. A corner hit is when you vigorously slam the ball in the corner of a player's square. Corner hits are almost impossible to recover, but skilled players might be able to recover one.
Kitty-corner. In a square, a line drawn between one corner and the corner which is not adjacent to it.