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OpenStudy (anonymous):
From the earth, the moon subtends an angle of approximately 0.5°. If the distance to the moon is approximately 240,000 miles, find an approximation for the diameter of the moon accurate to the nearest hundred miles.
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OpenStudy (rulnick):
240000 tan(0.5 deg) = 2094.4 mi (could also use sin in place of tan, same result)
OpenStudy (rulnick):
rounds to 2100 mi, if you prefer
OpenStudy (rulnick):
both numbers are within 100 mi of the true diameter of the moon BTW
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