Components

The circle is decomposed into several components:

• Centre - the centre of the circle
• Radius - the distance from the centre of the circle to the circumference
  • diameter is $2 \cdot radius$
• Circumference - the outline of the circle
• Chord - a straight line of which the points both lie on the circumference
• Tangent - a straight line that makes only one point of contact with the circle (point of tangency), always perpendicular at a 90° angle

Info

TODO: Segment, sector, arc length

Distance Equation

$(x - a)^2 + (y - b)^2 = r^2$

$(a, b)$ - co-ordinate of the centre $(x, y)$ - any co-ordinate

Drawings