Difference between revisions of "Tangents Tool"
From GeoGebra Manual
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:* Selecting two circles ''c'' and ''d'' produces the common tangents to the two circles (up to 4). | :* Selecting two circles ''c'' and ''d'' produces the common tangents to the two circles (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| ''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 <math> y = x^2+2x+1 </math> rather than <math> f(x) = x^2 + 2x + 1 </math> if you want a '''conic''' (parabola) rather than a '''function'''.}} | ||
Revision as of 15:28, 11 December 2012
- Tangents to a conic section can be produced in several ways (see also Tangent command):
- Selecting a point A and a conic c produces all tangents through A to c.
- Selecting a line g and a conic c produces all tangents to c that are parallel to line g.
- Selecting a point A and a function f produces the tangent line to f in x = x(A).
- Selecting two circles c and d produces the common tangents to the two circles (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.
