WHAT YOU NEED: two pieces of paper/card, pencil, scissors, ruler. Image caption, STEP 1: Place one piece of card on top of the other and use the ruler to draw a line from the bottom left corner of the ...
https://doi.org/10.4169/college.math.j.48.1.51 • https://www.jstor.org/stable/10.4169/college.math.j.48.1.51 Copy URL By using the ellipse with foci at the extreme ...
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