An ACUTE (all angles are acute) triangle contains three acute angles (each angle of an acute triangle is less than 90 degrees).

__Acute Angle Definition__
The acute angle is the small angle which is less than 90° but more than zero degrees

sum of the angles of an acute triangle is always 180 degrees.

An acute triangle may be isosceles,scalene or equilateral.

The right triangle has one 90 degree angle and two acute (< 90 degree) angles

An equilateral triangle is a specific type of acute triangle where the three angles have an equal measure of 180°/3 = 60°.

Figure:Acute Triangle |