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                        • Mathematically equal

                        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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