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Q: The equation for the circle is x2 plus y2 equals 121 What is the length of the circle's radius?

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The ' 1 ' in that equation is the radius.

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10. Equation of circle is x2 + y2 = r2. Consider: when x = 0 y2 must = 100 so y = 10 which describes a circle centre the origin, radius 10. Similarly when x = 10 y must be 0.

11 = sqrt of 121. it is a circle centred on the origin think what would happen on the line x=0 (The y axis) the equation simplifies to y2 = 121 or y =11 you can also think of eqn of a circle as x2+y2=r2

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x2 + y2 = 49

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