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A 3 C3 v-e^tiM

CP ax&h

conjusme diametcrs. M    O

Fig.

ELLIPSE

1    Major and minor axes (diameters) of the ellipse

2    Auxiliary circles method

3    Trammel method

4    Pins-and-string method: the “gardener’s ellipse” ( PFi + PF2 = 2a)

Fi and F₂ are each called a focus

5    From the properties of the ellipse:

dj and are each called a directrix - the ratio of PF₍ to PM of the distances(from the focus and the directrix respectively) is constant.

QR is the tangent and PN is the normal to the ellipse at P.