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A circle centre (0, 0) and radius r has equation x² + y² = r²

The circle x² + y² = 36 has:

r² = 36

→ radius = 6

Q: What is the radius of the circle with the equation x² plus y² equals 36?

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Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..

Radius = 1111

7

Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.

x^2+y^2=36

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Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..

Radius = 1111

If that equals 16 then the radius is 4

9

8

7

Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.

x^2+y^2=36

That's the equation of a circle with its center at the origin and a radius of 8.

The radius is sqrt(12) = 3.464 (rounded)

The ' 1 ' in that equation is the radius.

3 (which is the sqrt of 9)