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(x − h)2 + (y − k)2 = r2 is called the standard form equation for a circle with a center at (h, k) and radius r. By multiplying and collecting terms, the standard form equation can be written as x2 + y2−2hx −2ky + h2 + k2 = r2 which is fits into the general conic equation Ax2 + Cy2 + Dx + Ey +F = 0. ................
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