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Lesser-Known Math Terms

 Lattice Point A point with x- and y-coordinates that are both integers. These are often the points on a graph where the grid lines cross (assuming the lines are every 1 unit). Quadrantal Angle Any angle with a measure that is a multiple of 90°. Oblique Angle Any angle that is not 90° or a multiple of 90°. That is, any angle that is not quadrantal. Oblique Triangle Any triangle that is not a right triangle. Reflex Angle Any angle with a measure greater than 180°. Minuend In subtraction, the number from which you are subtracting. For example, in 10 - 4, the minuend is 10. Subtrahend In subtraction, the number that you are subtracting. For example, in 10 - 4, the subtrahend is 4. Addend One of the numbers in an addition problem. For example, in 5 + 6, both 5 and 6 are addends. Radicand The part under the radical sign, as in a square root or any root. Operand A general term for the input to a function. For example, in sin (x+1), the operand is x+1 Solidus The line between the numerator and denominator in division. IE the "slash" in 5/8. Vinculum The line over repeating decimals. More generally, a line over a few things to indicate that they are linked in some way, such as when naming line segments, or when negating a logical expression.