9 of68 Angles Training
An acute angle is smaller than a right angle.  An obtuse angle is larger than a right angle.
You can usually tell if an angle is right, acute, or obtuse without a protractor, just by looking at it. A right angle is like the corner of a square. Anything smaller than a right angle is an acute angle, and anything bigger than a right angle but smaller than a straight line is an obtuse angle.
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