Question

Match the following laws of Kepler with their correct order:

• A. The law of periods
• B. The law of orbits
• C. The law of areas

Answer 1

Kepler's $1st$ law is the law of orbits, which states that the orbit of a planet is an ellipse with the Sun at one of the foci.
Kepler's $2nd$ law is the law of areas, which states that the line joining the planet and the Sun sweeps equal areas in equal intervals of time.
Kepler's $3rd$ law is the law of periods, which states that the square of planet's orbital period around the Sun is directly proportional to the cube of mean distance of the planet from the Sun i.e. $T^2\propto r^3$.