ellipse by general method
Post on 13-Jun-2015
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F
A
B
C
V
E
1
1’
Given CF=65mm
Given, eccentricity=3/4. Therefore divide CF in 7 equal parts and mark V at 3rd division from F
Draw an ellipse by general method, given distance of focus from directrix 65mm and eccentricity ¾.
a
b c
d
ef
a’b’ f’
c’ e’ d’
a’
b’
f’
c’ e’
d’
45°
a1
f1 e1
d1
b1 c1
60°
a1
b1
c1
d1
e1
f1
a1’
b1’
c1’
d1’
e1’
f1’
PROBLEM
A regular hexagon of 40mm side has a corner in the HP. Its surface inclined at45° to the HP and the top view of the diagonal through the corner which is in the HP makes an angle of 60° with the VP. Draw its projections.
Plane parallel to HPPlane inclined to HP at 45°and ┴ to VP
Top view of the diagonal making 60° with the VP.
YX
P1
1’
2’
3’4’
5’
6’
7’
9’
8’10’
11’
12’
1
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P2
P3P4
P5
P6
P7
P8
P9
P10
P11
P12
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
B
C D
E
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1’
F
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3’
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4’
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