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Graphing a Conic Section 14 - 2
•Conic section graphs can be drawn in blue only.
•You cannot overwrite conic section graphs.
• The calculator automatically clears the screen before drawing a new conic
section graph.
•You can use trace, scroll, zoom, or sketch after graphing a conic section.
However, a conic section graph cannot be scrolled while using trace.
•You cannot incorporate graphing of a conic section into a program.
x
-intercept A’
x
-intercept A
y
-intercept B’
y
-intercept B
Focus F’ Focus F
Vertex A
Directrix
l
Axis of symmetry
Focus F (p, 0)
•A parabola is the locus of points equidistant from fixed line l and fixed point F
not on the line. Fixed point F is the “focus,” fixed line l is the “directrix,” the
horizontal line that passes through the focus directrix is the “axis of symme-
try,” the length of a straight line that intersects the parabola, passes through
the locus, and is parallel to fixed line l is the “latus rectum,” and point A where
the parabola intersects the axis of symmetry is the “vertex.”
•An ellipse is the locus of points the sum of the distances of each of which
from two fixed points F and F’ is constant. Points F and F’ are the “foci,”
points A, A’, B, and B’ where the ellipse intersects the x- and y-axes are the
“vertexes,” the x-coordinate values of vertexes A and A’ are called
x-intercepts, and the y-coordinate values of vertexes B and B’ are called
y-intercepts.
Latus rectum
CFX
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