Conic Sections. College Algebra
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1 Conic Sections College Algebra
2 Conic Sections A conic section, or conic, is a shape resulting from intersecting a right circular cone with a plane. The angle at which the plane intersects the cone determines the shape. Ellipse Hyperbola Parabola
3 Ellipses An ellipse is the set of all points x, y in a plane such that the sum of their distances from two fixed points is a constant. Each fixed point is called a focus (plural: foci). Every ellipse has two axes of symmetry. The longer axis is called the major axis, and the shorter axis is called the minor axis. Each endpoint of the major axis is the vertex of the ellipse (plural: vertices), and each endpoint of the minor axis is a co-vertex of the ellipse. The center of an ellipse is the midpoint of both the major and minor axes. The axes are perpendicular at the center. The foci always lie on the major axis, and the sum of the distances from the foci to any point on the ellipse (the constant sum) is greater than the distance between the foci.
4 Ellipses
5 Equation of a Horizontal Ellipse The standard form of the equation of an ellipse with center h, k axis parallel to the x-axis is a > b the length of the major axis is 2a &'( ) * ) +,'- ). ) = 1, where the coordinates of the vertices are h ± a, k the length of the minor axis is 2b the coordinates of the co-vertices are h, k ± b the coordinates of the foci are h ± c, k where c 7 = a 7 b 7 and major
6 Equation of a Vertical Ellipse The standard form of the equation of an ellipse with center h, k axis parallel to the y-axis is a > b the length of the major axis is 2a &'( ). ) +,'- ) * ) = 1, where the coordinates of the vertices are h, k ± a the length of the minor axis is 2b the coordinates of the co-vertices are h ± b, k the coordinates of the foci are h, k ± c where c 7 = a 7 b 7 and major
7 Finding the Equation of an Ellipse Given the vertices and foci of an ellipse not centered at the origin, write its equation in standard form. 1. Determine whether the major axis is parallel to the x-axis (or y-axis) by checking if the y-coordinates (or x-coordinates) of the given vertices and foci are the same, and use the appropriate standard form. 2. Identify the center of the ellipse (h, k) using the midpoint formula and the given coordinates for the vertices.
8 Finding the Equation of an Ellipse (cont.) 3. Find a 7 by solving for the length of the major axis, 2a, which is the distance between the given vertices. 4. Find c 7 using h and k, found in Step 2, along with the given coordinates for the foci. 5. Solve for b 7 using the equation c 7 = a 7 b Substitute the values for h, k, a 7, and b 7 into the standard form of the equation determined in Step 1.
9 Graphs of Ellipses Given an equation of an ellipse in standard form, graph the ellipse. 1. Locate the center at (h, k). 2. Determine the coordinates of the vertices and co-vertices at (h ± a, k) and h, k ± b. 3. Draw a smooth curve to form the ellipse. Example: &;7 ) Center is at ( 2,5). < +,'= ) > = 1 Major axis is parallel to y-axis a = 3, b = 2, so vertices at ( 2,8) and ( 2,2)
10 Equations of an Ellipse Given a general form of an equation of an ellipse, express the equation in standard form. 1. Recognize that an ellipse described by an equation in the form ax 7 + by 7 + cx + dy + e = 0 is in general form. 2. Group terms that contain the same variable and move the constant term to the opposite side of the equation. 3. Factor out the coefficients of the x 7 and y 7 terms. 4. Complete the square for each variable to rewrite the equation as m F x h 7 + m 7 y k 7 = m G where m F, m 7, and m G are constants. 5. Divide both sides of the equation by the constant term m F m 7.
11 Hyperbolas A hyperbola is the set of all points x, y in a plane such that the difference of the distances between x, y and the foci is a positive constant. Every hyperbola has two axes of symmetry. 1. The transverse axis is a line segment that passes through the center of the hyperbola and has vertices as its endpoints. The foci lie on the line that contains the transverse axis. 2. The conjugate axis is perpendicular to the transverse axis and has the co-vertices as its endpoints. The center of a hyperbola is the midpoint of both the transverse and conjugate axes, where they intersect.
12 Hyperbolas Every hyperbola has two asymptotes that pass through its center. As a hyperbola recedes from the center, its branches approach these asymptotes. The central rectangle of the hyperbola is centered at the origin with sides that pass through each vertex and co-vertex.
13 Equation of a Horizontal Hyperbola The standard form of the equation of a hyperbola with center h, k and transverse axis parallel to the x-axis is &'( ) * ),'- ). ) = 1, where the length of the transverse axis is 2a the coordinates of the vertices are h ± a, k the length of the conjugate axis is 2b the coordinates of the co-vertices are h, k ± b the distance between the foci is 2c, where c 7 = a 7 + b 7 the coordinates of the foci are h ± c, k
14 Equation of a Vertical Hyperbola The standard form of the equation of a hyperbola with center h, k and transverse axis parallel to the y-axis is,'- ) * ) &'( ). ) = 1, where the length of the transverse axis is 2a the coordinates of the vertices are h, k ± a the length of the conjugate axis is 2b the coordinates of the co-vertices are h ± b, k the distance between the foci is 2c, where c 7 = a 7 + b 7 the coordinates of the foci are h, k ± c
15 Asymptotes of a Hyperbola The asymptotes of a hyperbola coincide with the diagonals of the central rectangle. For a horizontal hyperbola, the length of the rectangle is 2a and its width is 2b. The slopes of the diagonals are ±., and each diagonal passes * through the center h, k. Using the point-slope formula, it is simple to show that the equations of the asymptotes are y = ±. * x h + k. For a vertical hyperbola, the equations of the asymptotes are y = ± * x h + k..
16 Hyperbolas Not Centered at the Origin
17 Finding the Equation of a Hyperbola Given the vertices and foci of a hyperbola centered at h, k, write its equation in standard form. 1. Determine whether the transverse axis is parallel to the x-axis (or y-axis) by checking if the y-coordinates (or x-coordinates) of the given vertices and foci are the same, and use the appropriate standard form. 2. Identify the center of the hyperbola (h, k) using the midpoint formula and the given coordinates for the vertices.
18 Finding the Equation of a Hyperbola (cont.) 3. Find a 7 by solving for the length of the transverse axis, 2a, which is the distance between the given vertices. 4. Find c 7 using h and k, found in Step 2, along with the given coordinates for the foci. 5. Solve b 7 using the equation b 7 = c 7 a Substitute the values for h, k, a 7, and b 7 into the standard form of the equation determined in Step 1.
19 Graphs of Hyperbolas Given an equation of a hyperbola in standard form, graph the hyperbola. 1. Determine the orientation of the transverse axis by comparing the equation to the standard forms for vertical and horizontal hyperbolas. 2. Determine the coordinates of the vertices and co-vertices a. Horizontal hyperbola: at (h ± a, k) and h, k ± b b. Vertical hyperbola: at (h, k ± a) and h ± b, k 3. Sketch the central rectangle and extend the diagonals to show the asymptotes. 4. Draw two smooth curves to form the hyperbola.
20 Desmos Interactive Topic: transformations of hyperbolas
21 Parabolas A parabola is the set of all points x, y in a plane that are the same distance from a fixed line, called the directrix, and a fixed point not on the directrix, called the focus. The axis of symmetry passes through the focus and vertex and is perpendicular to the directrix. The vertex is the midpoint between the directrix and the focus. The line segment that passes through the focus and is parallel to the directrix is called the latus rectum, also called the focal diameter.
22 Parabolas with Vertex at the Origin For a parabola whose axis of symmetry is the x-axis: Standard form equation is y 7 = 4px Focus is at p, 0 and the directrix line is x = p Endpoints of the focal diameter are at p, ±2p If p > 0, the parabola opens right. If p < 0, the parabola opens left. For a parabola whose axis of symmetry is the y-axis: Standard form equation is x 7 = 4py Focus is at 0, p and the directrix line is y = p Endpoints of the focal diameter are at ±2p, p If p > 0, the parabola opens up. If p < 0, the parabola opens down.
23 Graphs of Parabolas with Vertex at the Origin Given a standard form equation for a parabola centered at 0, 0, sketch the graph. 1. Determine which of the standard forms y 7 = 4px or x 7 = 4py applies. 2. Set 4p equal to the coefficient of the first-degree polynomial term to solve for the coordinates of the focus, at p, 0 for horizontal parabolas or at 0, p for vertical parabolas. 3. Find the endpoints of the focal diameter at p, ±2p for horizontal parabolas or at ±2p, p for vertical parabolas. 4. Draw a smooth curve that passes through both endpoints and the vertex at the origin.
24 Desmos Interactive Topic: find the focus, directrix, and endpoints of the focal diameter of a parabola whose vertex is at the origin
25 Parabolas with Vertices Not at the Origin If a parabola is translated h units horizontally and k units vertically, the vertex will be h, k. This translation results in the standard form of the equation with x replaced by x h and y replaced by y k. Horizontal Parabola Vertical Parabola Axis of Symmetry y = k x = h Equation y k 7 = 4p x h x h 7 = 4p y k Focus h + p, k h, k + p Directrix x = h p y = k p Endpoints of Focal Diameter h + p, k ± 2p h ± 2p, k + p
26 Desmos Interactive Topic: find the vertex, axis of symmetry, focus, directrix, and endpoints of the focal diameter of a parabola whose vertex is not at the origin
27 Quick Review What are the three types of conic sections? From the standard form equation of an ellipse, how can you tell if the major axis is a vertical line or a horizontal line? What is the transverse axis of a hyperbola? From the standard form equation of a hyperbola, how do you find the line equations for the asymptotes? What is the focal diameter? What are the coordinates of the vertices and co-vertices of a hyperbola? What is a directrix? How can you tell in which direction a parabola opens?
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