Not necessarily. I think it can be any angle in mathematics, but obviouly if you're building corners in houses, it helps if they're 90 degrees.
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A Right Triangle is a triangle that has one corner with a 90-degree angle. So a Right Angle is an angle of 90 Degrees or also known as Perpendicular angle.
A 90 degree angle
A square corner is a 90° angle which is called a "Right angle".
A Triangle with a perfectly 90 Degree angle, which also should have a corner which is perfectly square. :D
It does not; if there is no 90 degree angle there is no hypotenuse.