The Ellipse is a conical shape that is found by cutting a cone or a cylinder at an angle to its axis. It is found in question 6 of the higher level Junior Cert exam and is accompanied in this question by the parabola. The key to getting top marks in the ellipse and parabola, besides the correct constructions is the freehand curve. Avoid scribbles, messy curves, and pointed curves. The curve should be one continuous clean curve. A lot can be said for presentation in the examiners eyes. The key principles pupils are required to understand are: - Constructing an ellipse (vertical/horizontal/or at an angle) with the major and minor axes. - Locating focal points. - Determining the minor axis, given the major axis and the focal points. - Determining the major axis, given the minor axis and the focal points. - Determining the minor axis, given the major axis and a point on the curve. - Determining the major axis, given the minor axis and a point on the curve. - Determining the major axis, given a point on the curve and the focal points. - Draw a tangent & normal to a point on the curve. - Draw a tangent from a point outside the curve. - Draw a tangent at a given angle. Click on the PowerPoint file below to view the construction of each of the principles above. |
the_ellipse.pptx | |
File Size: | 1505 kb |
File Type: | pptx |