Acute Angle - An angle that is less than 90 degrees.
Right Angle - An angle that is exactly 90 degrees.
Obtuse Angle - An angle that is more than 90 degrees and less than 180 degrees.
There is also:
Straight Angle - An angle that is exactly 180 degrees.
Reflex Angle - An angle that is more than 180 degrees.
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A Triangle. Source: Math Class
acute, obuse, or right angles
An obtuse triangle has 1 obtuse angle and 2 different acute angles with all 3 angles adding up to 180 degrees.
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1. Acute Angle 2. Right Angle 3. Obtuse Angle