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A triangle is a plane shape which always has three sides, and here is the funny thing, there are three types of triangles.Here are the three types of triangles and their definitions:

Equilateral Triangle:
A triangle with the three sides having the same measurement and also the triangle has all three same angles.(HINT* A good way to remember a equal-lateral triangle is the equal in the word equal-lateral because all the sides of a equal-lateral triangle are equal!)

Isosceles Triangle:
An isosceles triangle is a triangle which has two sides that are the same and only one side is different and also a isosceles triangle has only two same angles.(HINT*A good way to remember a isosceles triangle is by the two letter s in the word isosceles because a isosceles triangle has two same sides!)

Scalene Triangle:
A scalene triangle is a triangle with all sides different.The angles of a scalene triangle do not match also.(HINT* A good way to remember a scalene triangle is to always check that it is not isosceles and equal-lateral because then it is surely a scalene triangle because a scalene triangle has no same sides!)

Another thing about triangles is that all the angles in a triangle add up to 180 degrees.Also another way to identify a triangle is to look for no parallel lines.