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?
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
