Arc'tan'gent was created on 2000-09-25.
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-- Measure how far the slope rises in 100-ft of horizontal distance.-- That number is the percent of slope, or the "grade".-- If you want the angle of the slope, divide the number by 100, and look upthe "arctangent" of the answer in a table or on a calculator.
You cannot calculate the angle using tangent: you need to use the inverse function: arctangent. The answer will be an angle, x, in the principal range (-90, 90) degrees. But it could be any (x + 180*k) for any integer k.
To find the angle ( a ) for which ( \tan a = 0.42 ), you can use the inverse tangent function (also known as arctangent). This can be calculated using a calculator or software that provides trigonometric functions. The result will give you ( a ) in radians or degrees, depending on your calculator's settings. Specifically, ( a \approx 22.62^\circ ) or ( a \approx 0.394 ) radians.
Here's a list including words (alphabetically) posted by several WikiUsers: Abscissa, absolute, abstract/abstraction, add/addition/additive, affine, algebra/algebraic, algorithm, analog, analysis/analytic/analytical, angle, approximate/approximation, arc/arcsine/arctangent, area, arithmetic/arithmatic, associative, asymtote/asymtotic, axiom/axiomatic,.... There are, doubtless, many others. And some can even be made up using a simple prefix. Here are some examples: a (adimentional), anti (antideritive/antilog/antipode/...),