1. To form a closed figure we need atleast  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX sides.
2. A three sided closed plane figure is called a  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX.
3. The point of intersection of two sides of the triangle is called  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX.
4.  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX triangle have each angle measure 60 degrees.
5. In  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX triangle one angle is 90 degrees.
6. A triangle in which all the sides are of different length is called  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX.
7. The sum of any two sides of a triangle is greater than the third side known as  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX.
8. The distance between  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX remains the same.
9. If an angle of a triangle is an obtuse angle then it is called an  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX.
10. A triangle can have  3EQUILATERALOBTUSE ANGLED TRIANGLEPARALLEL LINESRIGHT ANGLEDSCALENE TRIANGLETHREETRIANGLETRIANGLE INEQUALITYVERTEX acute angles.