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

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Q: Find the radius for a circle with the equation x2 plus y2 equals 9?
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What is the approximate area of a circle with a radius of 3 feet?

Area of a circle equals pi (~3.14) multiplied by the radius squared. So to find the area of that circle your equation is (3.14)(3)^2 which equals approximately 27.


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The inner circle is x2 + y2 = 4. The radius of the inner circle is the square root of 4, which is 2. To find the radius of the outer circle, multiply 2 times 4. The radius of the outer circle is 8. Square 8 (82 or 8 x 8) to find the number to put into the equation of the outer circle. This is 64. The equation for the outer circle is x2 + y2 = 64.


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Which equation could be used to find the circumference of a ball with a radius of 5 inches?

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A circle with the radius of 21cm would have an area of approximately 1384.74 cm. You would find this by using the equation of pi*(radius^2) = pi*(21^2).


When you are given pi of a circle how do you find the radius and diameter?

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To find the circumference of a circle the equation would be pi multiplied by diameter, or radius squared. the answer would be 31.415 units squared.


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How do you find a area with the diameter of a circle?

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Circumference = 2*Ï€*radius = 20*Ï€ feet


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multiple the diameter by 2 to get the radius, then use your equation and go from there


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