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Math
Geometry
Circles in Geometry
Arcs and Central Angles
Circumference and Pi

Practice problem

Circumference and Pi

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A radian is an angle measure that corresponds with an arclength of r on a circle with radius r. How many radians are in a circle?

Choose one answer

Option A: A

2 $\pi$

Option B: B

4 $\pi$

Option C: C

$\pi^2$

Option D: D

2 $\pi^2$

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