Inverse Tangent Function: A mathematical function that returns the angle whose tangent is equal to a given value. For example, arctan(1) = π/4 radians or 45 degrees.
Coordinate Plane: A two-dimensional plane formed by two perpendicular number lines called axes (usually x and y), where points are defined by their distances from these axes.
Tangent: In trigonometry, it refers to a ratio of two sides of a right triangle—opposite over adjacent—and also represents the slope of a line in relation to the x-axis.