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                      Example: Equation of a circumference

                      Reading time: 1min

                      Consider the following question:

                      with correct answer:

                      Then, the following answers will be accepted or rejected according to the table below:

                      Student answer Validation
                      (x-1)²+(y-2)²=9
                      x²-2x+1+y²-4y+4=9
                      x²+y²-2x-4y+5=9
                      x²+y²-2x-4y=4
                      x²+y²-2x-4y-4=0

                       

                       

                       

                       

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