In a crater, the slope of the side of the crater is simply the arc-tangent of the height difference divided by the horizontal distance.
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An arctangent is any of several single-valued or multivalued functions which are inverses of the tangent function.
The inverse tangent, also called the arc-tangent.
Greater, crater, freighter, traitor, separator, elevator, designator, refrigerator,
It basically means a conspicious crater on the moonAnswer:The lunar crater was named after Copernicus the astronomer. His name in turn, can be traced to a village in Silesia called Kopernik where his father came from. Families often took the name of their place of origin as their family name.
An inverse operation undoes it's composite operation. For example, Addition and Subtraction are inverses of each other, as are Multiplication and Division, as are Exponentiation and Logarithms, as are Sine and ArcSine, Cosine and ArcCosine, Tangent and ArcTangent, Secant and ArcSecant, Cosecant and ArcCosecant, and Cotangent and ArcCotangent