◆Definition of a polygon:- A polygon is any 2-dimensional shape formed with straight lines, such that triangles quadrilaterals Pentagons and hexagons etc.
◆Definition of A Triangle :- A three sided polygon is called triangle.
◆Definition of A Scalene Triangle :- A triangle having three unequal sides is called scalene triangle.
◆Definition of A Isosceles Triangle:- A triangle having any two sides equal is called Isosceles triangle.
◆Definition of A Equilateral Triangle :- A triangle having all sides equal is called equilateral triangle.
◆Definition of A Acute Angled Triangle:- A triangle having all the three acute angles is acute angle is called acute angled triangle.
◆Definition of A Obtuse angled triangle :- A triangle having any one Obtuse angle is called obtuse angled triangle.
◆Definition of A Right angled triangle :- A triangle having one angle as right angle is called right angled triangle.
◆Perimeter of a Triangle :- The sum of all the three sides of a triangle is called it's perimeter.
◆Median of a Triangle :- The line joining the vertex to the mid point of opposite side of a triangle is called it median.
◆Altitude of a triangle :- The perpendicular drawn from vertex to the opposite side of a triangle is called it's altitude.
◆Bisector of Angle of a triangle:- The line bisecting the vertex angle of triangle is called bisector of angle of a triangle.
◆Equiangular Triangle :- If corresponding angles of two triangles are same , then they are called equiangular triangles.
◆Similar shapes :- Figures having same shapes but different size , are called similar shapes.
◆Similar polygon:- Two polygon are similar , if their corresponding angles are equal and their corresponding sides are in the same ratio.(i.e. proportion)
◆Note:- two congruent figures are also similar but the converse is not true i.e. similar figures are not always congruent.
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