A 90-degree angle looks like one corner of a square or a rectangle.
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A 90 degree angle, also known as a right angle, looks like the corner of a square or rectangle. The two lines that form the 90 degree angle are perpendicular to one another.
It's hard to explain without visual representation. But imagine a 90 degree right angle. Okay, it makes an L, now image a 90 degree angle a little more acute (smaller than 90) that in sense is a 65 degree angle.
A 140 degree angle is about half way between a 90 degree angle, which has lines that are perpendicular to each other, and a 180 degree angle, which is a straight line. A 140 degree angle is an obtuse angle which has a line a little over half way between the 90 degree and 180 degree angles.
It is an an acute angle that is less than 90 degrees but greater than 0.
A 90 degree angle is a right angle.