Maths Question

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11) The point D, E and F have co-ordinates (-2,0), (0,-1) and (2,3) respectively.
i) calculate the gradient of DE
ii) Find the equation of the line through F, parallel to DE giving your answer in the from ax+by+c=0
iii) By calculating the gradient of EF, show that DEF is a right angled triangle.
iv) Calculate the length of DF
v) use the results of parts iii) and iv) to show that the equation of the circle which passes through D, E and F is given by the equation: x^2+y^2-3y-4=0

This will be useful for everyday life - I can see now why it's required.

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Tell me, has anyone ever used Algebra in real life? If not, why the **** did they teach it in school? <grr>