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
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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.
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.
If the sum of the squares of the shortest two sides is equal to the third squared then it is a right triangle. Examples are 3,4,5 and 5,12,13 and 7,24,25 and multiples of these.
a triangle
If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.