90 degrees
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20 degrees
It is 108 degrees
An obtuse angle is a measurement of 91 degrees to 179 degrees. If it is 90 degrees, it is a right angle. If it is 1 degree to 89 degrees it is an acute. If it is 180 degrees it is a straight angle.
A right angle has 90 degrees.
A right angle is 90 degrees.90