Coordinates of a point

Distance: vertical & horisontal

Distance (length of segment)

Distance formula

Midpoint of a line segment

Midpoint formula

Slope of a line

Slope formula

A point on a line

Equation of a line: y-intercept

Equation of a line: two points

Angle of inclination

Slopes: parallel & perpendicular lines

Equation of a circle: (0, 0) as centre

Equation of a circle: any centre

Tangent to a circle