There are two types of triangle:
1. Scalene triangle - no sides have the same length
2. Isosceles triangle - at least two sides have the same length
a. Equilateral triangle - an isosceles triangle with 3 sides the same length.
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Right angle triangle has a 90 degree angle and two acute anglesEquilateral triangle has 3 equal anglesIsosceles triangle has 2 equal anglesScalene triangles has 3 acute angles of different sizesObtuse triangle has 1 obtuse angle and 2 different acute angles
Six ways.
You can classify a triangle by its sides or by its angles. I.e: A triangle with three equal sides is an equilateral triangle A triangle with three equal angles is an equiangular triangle A triangle with two equal sides is an isosceles triangle
tripod
A, B, C Obtuse, acuteinterior, exterior