Triangles have 3 sides and 3 inside angles that add up to 180 degrees.
Scalene triangle
Obtuse triangle
Right angle triangle
Isosceles triangle
Equilateral triangle
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Some examples are: circle, square, rectangle, right angle triangle, equilateral triangle
Pascal's triangle
An isosceles triangle has 3 sides 2 of which are equal in length An isosceles triangle has 3 interior angles 2 of which are the same size
A scalene triangle is a triangle that does not have a right angle in it (i.e. not a right angled triangle) and does not have two (or three) sides with the same length (i.e. not an isosceles triangle or an equilateral triangle). An example is a triangle with sides of length 4cm, 5cm and 6cm.
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