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Write the equation of the circle: center at (0,0), diameter 18

User ReVerse
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1 Answer

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Answer:

x^2+y^2=81

Explanation:

the equation is

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

since the center is (0,0) you don't even put it in the equation

so all you will have is the x and the y

you leave in the square (^2)

you divide the diameter by 2 to get the radius

9

then you square the radius

81

User Maxswitcher
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