We will learn corners and sides of plane figures.
The lines that form a plane figure are called sides or edges. Two lines where they meet is called the corner.
This is a Rectangle.
Rectangle has 4 sides and 4 corners.
The opposite sides of a rectangle are equal.
This is a Triangle.
Triangle has 3 sides and 3 corners.
The sides of a triangle may or may not be equal.
This is a Circle.
Circle has no straight side and no corner.
It is a figure drawn with a curved line.