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Adapted from an original Texas Instruments file,
this adaptation was designed to be an 'electronic homework' for
students to work through on their own, prior to starting formal
lessons on the equation of the circle.
It exposes them to all the main ideas and scenarios
they were going to meet as part of the course that they were studying.
Students tended to take between 10 and 20 minutes
to complete this, on their own.