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Example Questions
Example Question #21 : How To Find The Area Of A Circle In Pre Algebra
What is the area of circle with a radius of ?
To find the area of a circle, use the equation:
Substitute the given value for radius:
Example Question #22 : How To Find The Area Of A Circle In Pre Algebra
Find the area of a circle with a radius of 12 inches.
The formula for the area of a circle is .
Plug your radius value in and you get .
Make sure your units are squared.
Example Question #23 : How To Find The Area Of A Circle In Pre Algebra
What is the area of a circle with diameter ?
The area of a circle is calculated with the equation .
is half of the diameter, which in our case is 3.
Example Question #24 : How To Find The Area Of A Circle In Pre Algebra
Find the area of a circle with a radius of 7 inches.
Use the formula for the area of a circle, , and plug in 7 for the radius to get . Make sure your answer is in units squared.
Example Question #131 : Geometry
Find the area of a circle with a circumference of .
The circumference equation is
If we plug into the equation, we can solve for the radius, which is .
Now, we look for the area of the circle based on the equation
Example Question #132 : Geometry
The area of a circle is . What is its radius?
Here, we are given the area of a circle and asked to solve for the radius. We know that the formula for the area of a circle is
Plugging in the area, we can cancel out the pi on each side of the equation, so that
Taking the square root, we find that
Example Question #25 : How To Find The Area Of A Circle In Pre Algebra
Find the diameter of a circle with an area of .
The area formula is
Plugging in the given number for A, we can solve for the radius and find that the radius is 8.
The diameter is twice the radius, so the diameter is .
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