Engineering Graphics: Unit I (c): Conic Sections
Parabola
Engineering Graphics (EG)
Parabola is defined as a curve traced out by a point moving in a plane such that its distance from a fixed point called Focus is always equal to its distance from a fixed line called Directrix.
PARABOLA Parabola is defined as a curve traced out by a point moving in a plane such that its distance from a fixed point called Focus is always equal to its distance from a fixed line called Directrix. ie., eccentricity of parabola is equal to one. eccentricity e = Distance of the point from the Focus / Distance of the point from the Directrix = Constant = 1 (unity) Refering the fig. 6.13. e = FP / PM = 1 ⸫ PF = PM and AV = VF The important terminologies of parabola are given below and shown in Fig. 6.14. Focus : Fixed point about which locus of point (Parabola) is described. Directrix : Fixed straight line about which locus of point (Parabola) is described. Abscissa (VF, VN): The distance along the axis between the vertex and a point on the axis. Ordinate (LF, MN): A line drawn from any point on the curve and perpendicular to the axis. Double Ordinate (LL', MM'): The ordinate extended to cut the parabola on the other side of the axis. Double ordinate is twice the length of the ordinate. Latus Rectum (LL'): The double ordinate passing through the Focus.
Engineering Graphics: Unit I (c): Conic Sections : Tag: : Engineering Graphics (EG) - Parabola
Engineering Graphics: Unit I (c): Conic Sections
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Engineering Graphics
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