High School Math : How to find the angle for a percentage of a circle

年代tudy concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 :Circles

A sector comprises 20% of a circle. What is the central angle of the sector?

Possible Answers:

Correct answer:

Explanation:

Proporations can be used to solve for the central angle. Letequal the angle of the sector.

Cross mulitply:

年代olve for:

Example Question #2 :Circles

Arcs

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Find the degree measure of.

Possible Answers:

Not enough information is given to answer this question.

Correct answer:

Explanation:

When two chords of a circle intersect, the measure of the angle they form is half the sum of the measures of the arcs they intercept. Therefore,

年代inceandform a linear pair,, and.

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