If you slice a cone at a diagonal, you get an
ellipse:
Here's what geometrically makes an ellipse an
ellipse:
You start with the two green dots...
So, if you put two nails on a board
and put a loop of string around them...
You can draw a perfect ellipse!
Just keep the string pulled tightly.
Think
about it... That loop of string will always be the same length -- won't
it? That's what makes an
ellipse! Continued on the
next
page
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