摘要
定理1和推论给出抛物线切线的判定及用尺规作图作出抛物线上任一点的切线的方法,定理2给出用尺规作图作出抛物线的方法。
Theorem 1 and its inference provide a method of judging a tangent of a paracurve and also a method of drawing a tangent with a ruler and compasses through any point on a paracurve. Theorem 2, on the other hand, supplies a way of drawing a paracurve with a ruler of compasses
关键词
抛物线
切线
弦
判定定理
tangent of a paracurve, chord of a paracurve, geometrical method