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Example Questions
Example Question #31 : How To Find The Length Of A Radius
True or false: A circle with diameter 25 has radius 12.5.
Possible Answers:
False
True
Correct answer:
True
Explanation:
The radius of a circle is one half (or 0.5) times its diameter, so a circle with diameter 25 has radius .
Example Question #191 : Circles
Use 3.14 for pi in the following question.
If the area of a circle measures , what is the length of its radius?
Possible Answers:
Correct answer:
Explanation:
First we need to know the formula for area of a circle where r is the radius and pi is 3.14. We plug in what we know so we get an equation that looks like this
We need to solve for r so first we divide both sides by pi (3.14)
Then we take the square root of both sides.
Since the square root of 400 is 20, the measure of the radius is 20cm
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