Ellipse
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Given the distance between the focus (F) and directrix (line CD) is 65mm and the eccentricity is 3/4, draw an ellipse by marking points along the directrix that are 3/4 of the way from the focus to the directrix.
Ellipse
- 1. Draw an ellipse by general method, given distance of focus from directrix 65mm and eccentricity ¾. A 1’ E C F V 1 B Given CF=65mm Given, eccentricity=3/4. Therefore divide CF in 7 equal parts and mark V at 3rd division from F
- 2. 3 4 2 P3 P4 5 3’ 4’ 1 2’ P2 P5 5’ 1’ P1 6’ P6 P12 12 6 12’ 7’ 11’ P7 P11 8’ 10’ 7 9’ P8 P10 11 P9 8 10 9
- 3. PROBLEM: A point moves in a plane in such a way that its distance from a fixed point is equal to its distance from a fixed line. The distance between fixed point and the fixed line is 65 mm. A 1’ E 2’ 3’ 4’ F C D 1 2 3 4 B