construct a table of attributes for geometric shapes. Shapes
are in the rows and the columns would be for number of sides,
the number and type of corners, etc.
draw circles using string, cardboard, a pin and a pencil.
Then draw ellipses using string, cardboard, two pins and a
an 8 inch length of string into a loop. Push a pin into
a piece of cardboard. Place the loope of string around the
ping. Use a pencil inside the loope to trace out a circle
as you pull the loop tight.
a second pin about 2 inches from the first pin. With the
loop of string enclosing both pins, trace an ellipse.
to planetary orbits.
Technology Teacher, April 1999, International Technology