14.2.12: Chapter 12
- Page ID
- 118266
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12.1 The Ellipse
center: vertices: and co-vertices: and foci: and
- ⓐ
- ⓑ The people are standing 358 feet apart.
12.2 The Hyperbola
Vertices: Foci:
The sides of the tower can be modeled by the hyperbolic equation.
12.1 Section Exercises
An ellipse is the set of all points in the plane the sum of whose distances from two fixed points, called the foci, is a constant.
This special case would be a circle.
It is symmetric about the x-axis, y-axis, and the origin.
yes;
yes;
Endpoints of major axis and Endpoints of minor axis and Foci at
Endpoints of major axis and Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Endpoints of major axis Endpoints of minor axis Foci at
Foci
Focus
Foci
Center Vertices Focus
Note that this ellipse is a circle. The circle has only one focus, which coincides with the center.
square units.
square units.
. Distance = 17.32 feet
Approximately 51.96 feet
12.2 Section Exercises
A hyperbola is the set of points in a plane the difference of whose distances from two fixed points (foci) is a positive constant.
The foci must lie on the transverse axis and be in the interior of the hyperbola.
The center must be the midpoint of the line segment joining the foci.
yes
yes
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
vertices: foci: asymptotes:
12.3 Section Exercises
A parabola is the set of points in the plane that lie equidistant from a fixed point, the focus, and a fixed line, the directrix.
The graph will open down.
The distance between the focus and directrix will increase.
yes
yes
At the point 2.25 feet above the vertex.
0.5625 feet
height is 7.2 feet
2304 feet
12.4 Section Exercises
The term causes a rotation of the graph to occur.
The conic section is a hyperbola.
It gives the angle of rotation of the axes in order to eliminate the term.
parabola
hyperbola
ellipse
parabola
parabola
ellipse
12.5 Section Exercises
If eccentricity is less than 1, it is an ellipse. If eccentricity is equal to 1, it is a parabola. If eccentricity is greater than 1, it is a hyperbola.
The directrix will be parallel to the polar axis.
One of the foci will be located at the origin.
Parabola with and directrix units below the pole.
Hyperbola with and directrix units above the pole.
Parabola with and directrix units to the right of the pole.
Ellipse with and directrix units to the right of the pole.
Hyperbola with and directrix units above the pole.
Hyperbola with and directrix units to the right of the pole.
Review Exercises
center: vertices: foci:
Approximately 35.71 feet
center: vertices: foci:
center: vertices: foci:
vertex: focus: directrix:
vertex: focus: directrix:
parabola
ellipse
Hyperbola with and directrix units to the left of the pole.
Ellipse with and directrix unit above the pole.