# Section 7.3 – The Ellipse Ellipse – a set of points in a plane whose distances from two fixed points is a constant.

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Section 7.3 – The Ellipse Ellipse – a set of points in a plane whose distances from two fixed points is a constant.

Section 7.3 – The Ellipse Ellipse – a set of points in a plane whose sum of the distances from two fixed points is a constant. 𝑑 𝐹 1 ,𝑃 +𝑑 𝐹 2 ,𝑃 =𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 Q 𝑑 𝐹 1 ,𝑄 +𝑑 𝐹 2 ,𝑄 = 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 =𝑑 𝐹 1 ,𝑃 +𝑑 𝐹 2 ,𝑃

Section 7.3 – The Ellipse Foci – the two fixed points, 𝐹 1 𝑎𝑛𝑑 𝐹 2 , whose distances from a single point on the ellipse is a constant. Major axis – the line that contains the foci and goes through the center of the ellipse. Vertices – the two points of intersection of the ellipse and the major axis, 𝑉 1 𝑎𝑛𝑑 𝑉 2 . Foci Minor axis – the line that is perpendicular to the major axis and goes through the center of the ellipse. Major axis Minor axis Vertices

Section 7.3 – The Ellipse

Section 7.3 – The Ellipse

Section 7.3 – The Ellipse Find the vertices for the major and minor axes, and the foci using the following equation of an ellipse. 𝑥 𝑦 2 9 =1 Major axis is along the x-axis Vertices of major axis: 𝑎 2 =25 𝑎=±5 −5,0 𝑎𝑛𝑑 (5,0) Vertices of the minor axis 𝑏 2 =9 𝑏=±3 0,3 𝑎𝑛𝑑 (0,−3) Foci 𝑐 2 = 𝑎 2 − 𝑏 2 𝑐 2 =25−9 𝑐 2 =16 𝑐=±4 −4,0 𝑎𝑛𝑑 (4,0)

Section 7.3 – The Ellipse Find the vertices for the major and minor axes, and the foci using the following equation of an ellipse. 4𝑥 2 +9 𝑦 2 =36 4𝑥 𝑦 =1 𝑥 𝑦 2 4 =1 Major axis is along the x-axis Vertices of major axis: 𝑎 2 =9 𝑎=±3 −3,0 𝑎𝑛𝑑 (3,0) Vertices of the minor axis 𝑏 2 =4 𝑏=±2 0,2 𝑎𝑛𝑑 (0,−2) Foci 𝑐 2 = 𝑎 2 − 𝑏 2 𝑐 2 =9−4 𝑐 2 =5 𝑐=± 5 − 5 ,0 𝑎𝑛𝑑 ( 5 ,0)

Section 7.3 – The Ellipse Find the equation of an ellipse given a vertex of 0,12 and a focus of (−2 11) . Graph the ellipse. Vertices of major axis: 0,12 𝑎𝑛𝑑 (0,−12) Vertices of the minor axis 𝑎=±12 𝑎 2 =144 𝑐=±2 11 𝑐 2 =44 𝑏 2 = 𝑎 2 − 𝑐 2 𝑏 2 =144−44 𝑏 2 =100 𝑏=±10 −10,0 𝑎𝑛𝑑 (10,0) 𝑥 2 𝑏 𝑦 2 𝑎 2 =1 𝑥 𝑦 =1

Section 7.3 – The Ellipse

Section 7.3 – The Ellipse Find the center, vertices, and foci given the following equation of an ellipse. (𝑥−3) (𝑦−9) 2 9 =1 Center: (3,9) Major axis is along the x-axis Foci Vertices: 𝑎 2 =25 𝑎=±5 𝑐 2 = 𝑎 2 − 𝑏 2 3−5,9 𝑎𝑛𝑑 (3+5,9) 𝑐 2 =25−9 −2,9 𝑎𝑛𝑑 (8,9) 𝑐 2 =16 Vertices of the minor axis 𝑐=±4 𝑏 2 =9 𝑏=±3 3−4,9 𝑎𝑛𝑑 (3+4,9) 3,9−3 𝑎𝑛𝑑 (3,9+3) −1,9 𝑎𝑛𝑑 (7,9) 3,6 𝑎𝑛𝑑 (3,12)

Section 7.3 – The Ellipse Find the center, vertices, and foci given the following equation of an ellipse. (𝑥−3) (𝑦−9) 2 9 =1 Center: (3,9) Vertices: −2,9 𝑎𝑛𝑑 (8,9) Vertices of the minor axis 3,6 𝑎𝑛𝑑 (3,12) Foci −1,9 𝑎𝑛𝑑 (7,9)

Section 7.3 – The Ellipse Find the center, the vertices of the major and minor axes, and the foci using the following equation of an ellipse. 16𝑥 2 +4 𝑦 2 +96𝑥−8𝑦+84=0 16𝑥 2 +96𝑥+4 𝑦 2 −8𝑦=−84 16(𝑥 2 +6𝑥)+4( 𝑦 2 −2𝑦)=−84 6 2 =3 −2 2 =−1 3 2 =9 (−1) 2 =1 16(𝑥 2 +6𝑥+9)+4 𝑦 2 −2𝑦+1 =− 16 (𝑥+3) 2 +4 (𝑦−1) 2 =64 16(𝑥+3) (𝑦−1) =1 (𝑥+3) (𝑦−1) =1

Section 7.3 – The Ellipse (𝑥+3) 2 4 + (𝑦−1) 2 16 =1 Center: (−3,1)
(𝑥+3) (𝑦−1) =1 Center: (−3,1) Foci Major axis: 𝑥=−3 (𝑣𝑒𝑟𝑡𝑖𝑐𝑎𝑙) Vertices: 𝑎 2 =16 𝑎=±4 𝑐 2 = 𝑎 2 − 𝑏 2 −3,1−4 𝑎𝑛𝑑 (−3,1+4) 𝑐 2 =16−4 −3,−3 𝑎𝑛𝑑 (−3,5) 𝑐 2 =12 Minor axis: 𝑦=1 (ℎ𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙) 𝑐=±2 3 Vertices of the minor axis −3,1− 𝑎𝑛𝑑 (−3, ) 𝑏 2 =4 𝑏=±2 −3,− 𝑎𝑛𝑑 (−3, 4.464) −3−2,1 𝑎𝑛𝑑 (−3+2,1) −5,1 𝑎𝑛𝑑 (−1,1)

Section 7.3 – The Ellipse (𝑥+3) 2 4 + (𝑦−1) 2 16 =1 Center: (−3,1)
(𝑥+3) (𝑦−1) =1 Center: (−3,1) Major axis vertices: −3,−3 𝑎𝑛𝑑 (−3,5) Minor axis vertices: −5,1 𝑎𝑛𝑑 (−1,1) Foci −3,− 𝑎𝑛𝑑 (−3,4.464)

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