Angles greater than 0 but less than 90 degres are acute angles
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Angles greater than 90 but less than 180 degrees are obtuse angles Angles greater than 180 but less than 360 degrees are reflex angles
Angles that are less than 90 degrees are called acute. They're angles with measures less then 90 but greater than 0. On the normal Cartesian coordinate plane, they lie in the first quadrant -- that is, in the upper-right hand side of the graph.
Obtuse
It is called Acute triangleIn an acute triangle, all angle are less than 90 degrees, so all angles are acute angles.
A scalene triangle