Abstract: The coefficients of an ellipse's algebraic equation are not unique. Multiplying these coefficients by a number $\delta \neq 0$ does not affect the ellipse's shape. In this paper it is shown that at a certain $\delta $ , called calibration number, direct relations between the coefficients and the parameters of the ellipse are found. This value of $\delta $ is found and is shown to be invariant. Useful results concerning invariants of an ellipse's equation are found using calibration.
Keywords: Calibration, ellipse's parameters.
Classification (MSC2000): 51M04
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