The Earth...

The Earth

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Distance between Earth-Moon = 60 R
Radius of the earth = R
`" "r=60R=60 times 6400 times 10^(3)" "(R=6400km)`
`" "theta=1sec=1/60"Min"=1/(60 times 60)"degree" rArr = 1/(60 times 60) times pi/180"radian"`
Then `r=l/theta=l=rtheta rArr l=60 times 6400 times 10^(3) times 1/(60 times 60) times pi/180`
`" "l=11.16 times 10^(3)"km"rArr"Diameter"(l)=11.16 times 10^(3)km`

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