1-89 degrees= ACUTE
90 degrees= RIGHT
91-180= OBTUSE
181-359= REFLEX
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scalene, equilateral, isosceles and right angle triangles
to tell what the angle is
The primary classification of a polygon is according to the number of sides (or vertices) that it has.If all the sides are of equal length and all the angles are of the same measure then it is a regular polygon.If any of the angles is a reflex angle then it is a concave polygon, otherwise it is convex.
All triangles have 3 sides and 3 interior angles that add up to 180 degrees and they are classified as follows:- Scalene has 3 acute angles of different sizes and different sides Right has a 90 degree angle and 2 acute angles with 2 sides being perpendicular Obtuse has an obtuse angle and 2 different acute angles and different sides Isosceles has has 2 equal angles and an apex angle and 2 equal sides Equilateral has 3 equal angles each being 60 degrees and 3 equal sides Acute angle is greater than 0 but less than 90 degrees Right angle is 90 degrees Obtuse angle is greater than 90 but less than 180 degrees
Classification of triangles by their sides:equilateral = 3 sides are equalisosceles = 2 sides are equalscalene =no equal sideClassification of triangles by their angles:acute = the 3 angles are less less than 90 degreesright = it has an angle which is 90 degreesobtuse = it has an angle which is more than 90 degrees