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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

In the figure above, inscribed triangle is equilateral. If the radius of the circle is , then the length of arc is

# Right-o!

### Explanation

An equilateral triangle has three equal sides, so the lengths of the three arcs must be equal, and thus each arc is of the circumference of the circle. The circumference of the circle is , so the length of arc  is of , or .

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