Here I was confused between circumference and arc. I chose arc, thinking circumference is a measure of a circle similar to area or radius, and arc is a shape such as boundary or point. The correct answer was circumference. So now I am confused. Can someone please explain why it should be circumference instead of arc? Is there another arc that could be inside the circle?

Every circle has a circumference. And a line drawn between the center of a circle and anywhere on the circumference is the radius

An arc exists between two distinct points on a circles circumference…

thank you!

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You’re welcome!