Linear function (Point-Slope form). General form of equation of a line. Parallel and perpendicular lines. Angle of a line with x-axis. Angle between two lines. Equation of a line that passes through two points. Distance between two points. Coordinates for the midpoint of a line segment. Distance from a point to a line. Circle in xy-plane. Area of a circle in xy-plane. Reflection symmetry over axes of xy-plane. Point symmetry over axes of xy-plane. Drawing vectors. Coordinates of vectors. Magnitude (length). Direction of vector. Equal vectors. Opposite vectors. Addition. Subtraction. Multiplying a vector by a number. Dot product. Cross product. Angle between vectors. Vector perpendicular to a line. Vector parallel to a line.