What is Kepler's third law of planetary motion?

Solution : 

Kepler’s third law of planetary motion (Law of periods) states that the square of the time period of revolution of a planet around the sun is directly proportional to the cube of the semi major axis of its elliptical orbit i.e.
T2 = R3
T = time taken by the planet to revolve once around the sun.
R = semi major axis of the elliptical orbit

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