In geometry, what is the center and radius of the circle given by ?
Answer and explanation
Correct answer: A. Center $$ and radius $r = 5$
- Step 1: Complete the squares: . Thus the center is and . **Answer: Center $$ and radius $r = 5$. Why not the others:** $(-3, 4)$ inverts signs, $r=25$ forgets the square root, and $(6, -8)$ omits halving.
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