Question

Describe a method to measure diameter of any planet..​

Answer 1

d=αD

where α= angular diameter of the planet (in rad)

d = diameter of the planet

D= distance of planet from earth (in metres)

Hope it helps :)

This formula is in Ch2 physics of 11th std

Answer 2

Answer:

The most common is to measure the apparent angular diameter of the planet – how big it looks against the sky – very precisely using a telescope. Combining this with a measure of its distance (deduced from its orbit around the Sun) reveals the planet'sactual size.

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