name the following law
the square of period of revolution around the sun is directly proportional to the cube of the mean distance of the planet from the sun

Solution : 

Kepler's laws:

• Kepler’s First Law (Law of Orbits)

• Every planet revolves around the sun in an elliptical orbit. The sun is situated at one foci of the ellipse.

• The closest point is P, called the perihelion, and the farthest point is A, called the aphelion.

• Kepler’s Second Law (Law of Areas)

The line joining a planet to the sun sweeps out equal areas in equal intervals of time, i.e., the areal velocity of the planet around the sun is constant.

• Kepler's third law (Law of periods)
The square of the time period of revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet.

It is a law connecting distance of the orbital body with its time period.
After much deliberation, Kepler arrived at the law that if T is the period of revolution of any planet and D is its semi-major axis from the sun, then
T²/D³ = k

Where k is a constant, which is the same for all the planets.