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Sheet No: 7, CURVES USED IN ENGINEERING PRACTICE, , 1) Construct an ellipse, with distance of the focus from the directrix as 50mm and, eccentricity as 2/3. Also, draw normal and tangent to the curve at a point 40mm, from the directrix., , 2) Construct a parabola, with the distance of the focus from the directrix as 50mm., Also, draw normal and tangent to the curve, at a point 40mm from the directrix., , 3) Construct a hyperbola, with the distance between the focus and the directrix as, 50mm and eccentricity as 3/2. Also, draw normal and tangent to the curve at a, point 30mm from the directrix., , 4) The major and minor axes of an ellipse are 120mm and 80mm. Draw an Ellipse, , a). Foci or arcs of circles method, b). Concentric circles Method, , c). Oblong method, , d). Parallelogram method, , 5) Construct a parabola with base 60mm and length of the axis 40mm. Draw tangent, , to the curve at a point 20mm from the base.