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21 December, 00:05

Worth 20 pts!

The equation of a circle is (x-11) 2 + (y+15) 2=144 .

What is the circle's radius?

Enter your answer in the box.

[] units

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Answers (1)
  1. 21 December, 02:47
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    The radius of a circle is always the square root of the number on the right. The other two numbers describe the center.

    Center: (11,-15) Opposite of what's in the brackets.

    Radius: sqrt (144) = 12
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