In which regions of the plane are the following inequalities true?
What is the compound region where either is true OR is true OR both?
What is the region where that AND AND are all true?
What is the region where
is true?
(Hint: Don't multiply it out -- think about how to calculate the distance of a point from an implicitly-defined plane and remember Pythagoras.)
What is the difference between and ? Does it matter?
© Adrian Bowyer 1996