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20 July, 09:36

If the moon's diameter is approximately 3500 km, what angle will this diameter subtend if the moon is observed when it is at a distance of about 400,000 km from earth?

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  1. 20 July, 10:05
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    Using the formula:

    S = r∅, where S will be the diameter of the moon, be the distance from the earth and ∅ be the subtended angle in radians.

    ∅ = 3500/400,000

    ∅ = 8.75 x 10⁻³ radians
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