The Earth-moon distance is about 60 Earth radius. What will be the approximate diameter of the Earth as seen from the moon?

Explanation

Earth moon distance, D=60r.
Diameter of earth, b=2r

As seen from moon
`implies theta=(Arc AB)/(Rad)=(2r)/(60r)=1/30Rad`
`therefore` Size of earth as seen from moon is `1/30`
radians or `(57^@30`)/30=2^@`