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 Then draw the circle (C) with diameter the segment [AB].

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Douine – Sixième – DNL maths – Ellipse

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How to draw an ellipse

 In the middle of your page, draw the 16 cm long segment [AB].

 Then draw the circle (C) with diameter the segment [AB].

 Mark a point M on diameter [AB].

 Draw the perpendicular line to segment [AB] through point M.

 This line cuts the circle in two points : point P and point R.

 Place two points in the middles of segment [MP] and segment [MR].

 Do it again and again with various points M placed regularly on the diameter.

 All together, the points situated in the various middles form an ellipse that you can draw.

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