SAT Circles Question
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Question 1 · Medium · MathDecember 2024 · Q10Circles · 0 solved
In the xy-plane, an equation of circle A is . Circle B has the same center as circle A but has a radius that is twice the radius of circle A. Which equation represents circle B?
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The trap here
SAT equation of a circle: the number on the right is r², not r — (x − h)² + (y − k)² = r². The SAT builds its wrong answers from students who read that last value as the radius.