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PARABOLA

PF- PM

Fig. 1 The axis, the width and depth ( or span and rise) of the parabola

Fig. 2 Parallelogram method

Fig. 3 Parabola by envelope method

Fig. 4 and Fig. 5 From the properties of the parabola: AB is the axis, E is the vertex, F is the focus, d is the directrix; the distance PF is always eąual to the distance PM.

Fig. 6 If the axis AB, the vertex E and the point P of the parabola are given, TP is the tangent and PN is the norma! to the parabola at P.