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Mathematics 9 Online
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.

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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