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Q: The equation for the circle here is x2 plus y2 equals 36 What is the length of the circle's radius?

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The ' 1 ' in that equation is the radius.

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.

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x2 + y2= 16

x2 + y2 = 25

x2 + y2 = 49

x2 + y2 = 25

x2 + y2 = 36

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The center of a circle is the same for all circles but the length of the radius can change

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If the centre of the circle is at the point (a, b), the equation is: (x - a)2+ (y - b)2= 100.

The diameter of the circle equals the length of a side of the square

The circles are concentric with centre (0,0). The radius of the outer circle is sqrt(72), that of the inner circle is sqrt(18). By Pythagoras, the length of the semichord is sqrt(72 - 18) = sqrt(54) units. Therefore the chord is 2*sqrt(54) = 6*sqrt(6) = 14.679 units (approx).

C=2(3.14)rThis is circumference equation for circles. If you have the circumference, you need to input it into the equation and solve for r. r is the radius of the circle, so to determine the diameter, which is 2 times the length of the radius, you just need to multiply the number you got for r times 2.

Equation of circle: (x+2)^2 +(y+3) = 49

Equation of circle: (x-3)^2 +(y-2)^2 = 49