ISEE Upper Level Math : How to find the angle for a percentage of a circle

Study concepts, example questions & explanations for ISEE Upper Level Math

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Example Questions

Example Question #1 : Sectors

Sector TYP occupies 43% of a circle. Find the degree measure of angle TYP.

 

Possible Answers:

Correct answer:

Explanation:

Sector TYP occupies 43% of a circle. Find the degree measure of angle TYP.

Use the following formula and solve for x:

Begin by dividing over the 100

Then multiply by 360

Example Question #2 : Sectors

If sector AJL covers 45% of circle J, what is the measure of sector AJL's central angle?

Possible Answers:

Correct answer:

Explanation:

If sector AJL covers 45% of circle J, what is the measure of sector AJL's central angle?

To find an angle measure from a percentage, simply convert the percentage to a decimal and then multiply it by 360 degrees.

So, our answer is 162 degrees.

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