exam Maths Puzzle Numerical Ability

The latitude of Princeton, New Jersey, is 40.5 degrees north of the equator. How far is it from Princeton to the equator if the diameter of the earth is 7920 miles?

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exam Other Question
Find the length, to the nearest tenth, of the apothem of a regular octogon whose sides are each 10 inches long???? i cannot figure out this question at all : 4a^4 b - 9a^2 b^3