10 Questions |
By Yonghs | Last updated: Jan 15, 2013
| Total Attempts: 352
Recall:tangent perpendicular to radius. tangents meet at a point equidistant from circumference. (isos. Triangle) alt seg thmangle at ctr = 2 angle at circumf. . . y-axis is x=0. So, lines parallel to y axis are x =? . . . x-axis is y=0. parallel lines have same gradient. product of gradient of perpendicular lines is -1.