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Celestial Scaling

If I keep a cm scale 25cm away from my eyes and observe the diameter of the moon is 6cm. If I know the accurate diameter of the moon, how can I calculate the distance between earth and moon from this observation?

distance of the ruler= 25cm

size of moon= 6cm

suppose,

diameter of moon=3500km

we know,

distance of moon/diameter=distance of ruler/ size of moon

=>distance of moon/3500km=25cm/6cm

so,distance of moon=14583.33333km

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