-- "It looks like a corner."
-- "Four of them arranged with their vertices (vertexes) all at the same point will exactly fit, with no overlap or space left over."
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A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.
A 90 degree angle is a right angle
A right angle. i think it's a right angle
A 90 degree angle is a right angle.
A 90-degree angle is commonly called a right angle.