The equation of a circle is (x−1)2+(y−2)2=36. What are the center and radius of the circle?Choose 1 answer:(A) The center is (1,2) and the radius is 6 .B The center is (1,−2) and the radius is 6 .(C) The center is (−1,2) and the radius is 6 .D The center is (1,2) and the radius is 36 .
Q. The equation of a circle is (x−1)2+(y−2)2=36. What are the center and radius of the circle?Choose 1 answer:(A) The center is (1,2) and the radius is 6 .B The center is (1,−2) and the radius is 6 .(C) The center is (−1,2) and the radius is 6 .D The center is (1,2) and the radius is 36 .
Equation of a Circle: The equation of a circle in the standard form is (x−h)2+(y−k)2=r2, where (h,k) is the center of the circle and r is the radius.
Comparing with Standard Form: The given equation of the circle is (x−1)2+(y−2)2=36. By comparing this with the standard form, we can directly read off the center and the radius of the circle.
Finding the Center: The center of the circle is (h,k)=(1,2) because the equation is in the form (x−h)2+(y−k)2=r2, and we have (x−1)2+(y−2)2=36.
Finding the Radius: The radius of the circle is the square root of the number on the right side of the equation, which is 36. The square root of 36 is 6.
Final Answer: Therefore, the center of the circle is (1,2) and the radius is 6. This corresponds to answer choice (A).
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