ASKSAGE: Sage Q&A Forum - RSS feed Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 02 Jul 2013 14:24:51 +0200Plot circle or ellipse with equation? the standard equation of a circle: x^2 + y^2 + 7*x - 2*y + 6 = 0 --Simplified-to--> (x+7/2)^2 + (y-1)^2 = 29/4 Standard formula of a circle: (x + (-h))^2 + (y + (-k))^2 = r^2 The center is represented by (h, k); radius by sqrt(r^2). So my first question is, is there are way I could insert either of the 1st 2 equations and have Sage 5.9 generate the circle? My second question similarly deals with an ellipse that has the simplified equation: ((x+2)^2)/9 + ((y-1)^2)/25 = 1 Its major axis is: (-2,-4) (-2,6) Minor axis is: (-5,1) (1,1) Standard form of an ellipse is: ((x - (-h))^2)/b^2 + ((y + (-k))^2)/a^2 Center is determined by analyzing the differences between the x2/x1, y2/y1 coordinates of the major or minor axis (i.e. midpoint formula). Could I generate an ellipse baed on the simplified equation? In case anyone's interested, the following thread has an unanswered question:, 02 Jul 2013 14:24:51 +0200