Standard equation of the circle and its definition Answer: Standard equation of the circle (x - h)² + (y -k)² = r² Where: (h,k) is the point representing the center of the circle h is the x-coordinate of the center k is the y-coordinate of the center r is the radius of the circle and r > 0. If the center of the circle is at origin , it means the center (h,k) is at (0,0). The standard equation for the circle with center at (0, 0) is: x² + y² = r²
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