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If all three angles of a triangle measure less that 90 degrees (if all three angles are acute), the triangle is an acute triangle.

A triangle that has a right angle (an angle the measures exactly 90 degrees) is a right triangle. (The other 2 angles will be acute angles.)

A triangle that has an angle that is greater than 90 degrees (an obtuse angle), is an obtuse triangle. (The other 2 angles will be acute angles.)

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