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Q: If the equation of a circle is x2 plus y2 equals 64what is its radius?

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Radius = 1111

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

If that equals 16 then the radius is 4

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

x^2+y^2=36

7

9

A circle centre (0, 0) and radius r has equation x² + y² = r² The circle x² + y² = 36 has: r² = 36 → radius = 6

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

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

The ' 1 ' in that equation is the radius.

The answer is indeterminate. For example, if the equation is of the form x2 - 2ax + y2 - 2by = 25, all that can be said of the radius of the circle is that it is greater than 5.

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