If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is a 6 b 16 c 36

asked Jun 27, 2016 141k views

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If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is

a 6
b 16
c 36

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1 vote

Answer:

the answer is 6

Explanation:

Floatingfrisbee answered Jun 29, 2016

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4 votes

The standard form of the equation of a circle:

(x-h)^2+(y-k)^2=r^2

r - radius

$(x+5)^2+(y-7)^2=36 \\ \Downarrow \\ r^2=36 \ and \ r>0 \\ r=6$

The answer is A. 6.

Bogatyr answered Jul 2, 2016

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