What are the Kepler's Laws of Planetary Motion?

Kepler's Law of Planetary Motion are:

 

a) Kepler's First Law (Law of Orbit): Every planet revolves around the sun in an elliptical orbit. The sun is situated at one focus of the ellipse.

 

b) Kepler's Second Law (Law of Area): The radius vector drawn from the sun to a planet sweeps equal areas in equal interval of time i.e. the areal velocity of the planet around the sun is constant.

 

c) Kepler's Third Law (Law of Period): the Square of the time period of revolution of a planet around the sun is directly proportional to the cube of semi major axis of the elliptical orbit i.e.