Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 165
Fig. no. MN = 2 a and draw PT ± to PN ; or take OT = OM and draw PT. Ineither way PT will be tangent at P. [Why?] … Fig. 111. (2) To draw a tangent to a parabola from an external point P. WithP as center, and PF as radiur, cut the directrix in R. Draw RQ parallel THE PARABOLA 149 to rX and cutting the parabola in Q. Draw PQ, which is the tangentrequired. For PF - PR, QF = Qli, .-. PQ bisects angle FQR. .-., etc.…
Geometry, Analytic
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