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 Sujet: arctangent
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 Lining up coins visually using geometry and trigonometry 2007-12-31 Jessica pose la question :a) In what order would you arrange a penny, a nickel, a dime, a quarter, and a half-dollar so that they all have the same apparent size? The diameters of the coins, in thousandths of inches, are as follows: penny, 750; nickel, 835; dime, 705; quarter, 955; half-dollar, 1205. b) How should the coins be placed, if the distance between the dime and the half-dollar is 100 units? How far from thw dime should your eye be to see that all the coins have the same apparent size? c) What angle do the coins subtend when they have the same apparent size?Stephen La Rocque lui répond. The interior angles of a right triangle 2006-05-20 Greg pose la question :I am wondering if there is a way to figure out the interior angles of a right triangle if we know ONLY the side lengths, and the trick is, we CANNOT use arctangent!Leeanne Boehm and Penny Nom lui répond.

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