Circle Tangent Calculator
About Circle Tangents
- A tangent line touches the circle at exactly one point
- The radius is perpendicular to the tangent at the point of tangency
- Two tangent lines can be drawn from any external point
- Tangent lines are equal in length from the external point
- The angle between tangent lines depends on distance from center
Note: The external point must be outside the circle to calculate tangent lines. The distance from the external point to each point of tangency is equal. This calculator uses the point-slope form of a line equation.