The number of rows of a matrix is the number of data points of the matrix.
The number of data points is 3.
The equation is given as:
The number of unknown is the minimum number of data points.
From the equation, we have:
The number of unknown variable is 3
Hence, the number of data points is 3.
Read more about data points and matrices at:
Step-by-step explanation:
You need at least 3 points to define a circle. By looking at the equation, you can see there are three unknown coefficients: D, E, and F. Therefore, you must solve 3 equations, so you need 3 points.