# Tangents Tool

From GeoGebra Manual

- Tangents to a conic section can be produced in several ways (see also Tangent command):
- Selecting a point and a conic produces all tangents through the point to the conic.
- Selecting a line and a conic produces all tangents to the conic that are parallel to the selected line.
- Selecting a point and a function produces the tangent line to the function in its point having the same x-coordinate of the selected point (e.g. if the point is
*A*, the tangent is drawn in*x = x(A)*). - Selecting two circles produces the common tangents to them (up to 4).

**Note:***x(A)*represents the*x*-coordinate of point*A*. If point*A*lies on the function graph, the tangent runs through point*A*.**Note:**Type y = x^2+2x+1 rather than f(x) = x^2 + 2x + 1 if you want a**conic**(parabola) rather than a**function**.