Symmetry Every line through center Ex 1) Write the equation given the center at (0,4) and a radius of 3. Center: (h,k) Radius: r Symmetry Every line through center Cone cut by a plane parallel to the base Real World: tunnels (h,k) r
Circles Steps to graph Steps to write equation Find center Find radius Plot center Count left, right, up and down to plot points Connect the 4 points with curve. Steps to write equation Find center Find radius Substitute into formula. Ex 3) Write the equation given the graph Ex 2) Graph (x-2)2 + (y+3)2 = 16 Center: (2, -3) Radius: Center: (-1, 1) Radius: 5 (x--1)2 + (y-1)2 = 52 (x+1)2 + (y-1)2 = 25 Circles
Cone cut by a plane at an angle through the sides Hyperbola Parabola Ellipse Cone cut by a plane at an angle through the sides Real World: Tunnels Cone cut by a plane perpendicular to the base Real World: tunnels Cone cut by a plane at an angle through the base and 1 side Real World: tunnels and overpasses