Circle Ellipse Parabola Hyperbola Equation (horiz. vertex): x2 + y2 = r2 x2 / a2 + y2 / b2 = 1 4px = y2 x2 / a2 - y2 / b2 = 1 Equations of Asymptotes:       y = ± (b/a)x Equation (vert. vertex): x2 + y2 = r2 y2 / a2 + x2 / b2 = 1 4py = x2 y2 / a2 - x2 / b2 = 1 Equations of Asymptotes:       x = ± (b/a)y Variables: r = circle radius a = major radius (= 1/2 length major axis) b = minor radius (= 1/2 length minor axis) c = distance center to focus p = distance from vertex to focus (or directrix) a = 1/2 length major axis b = 1/2 length minor axis c = distance center to focus Eccentricity: 0 c/a 1 c/a Relation to Focus: p = 0 a2 - b2 = c2 p = p a2 + b2 = c2 Definition: is the locus of all points which meet the condition... distance to the origin is constant sum of distances to each focus is constant distance to focus = distance to directrix difference between distances to each foci is constant

some thing specially for goiitians! try printing it and pasting in ur room! i promise u wont evr forget these basic formulas which sometimes tend to slip from our minds!