30 degrees
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30° Right angle = 90° One third of 90 is 30.
A right angle is 90 degrees, so one third of a right angle is 30 degrees.
Right angled triangle because the third angle must be 90 degrees.
One ninth of 90 degrees is 10.
An angle that is 120 degrees would be considered an "obtuse" angle. This is because its angle measurements exceed 90 degrees. Anything under 90 would be considered "acute".