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You do that by using the information you're given, combined with the facts you know

about a circle. Unfortunately, you haven't described either of those categories in your

question.

Probably the most important fact you'll need to know about a circle ... the one that

this test-question is designed to check you on ... is the formula for the circumference

of a circle:

Circumference = (pi) times (diameter).

We're noticing that you don't know that formula, and you're still calling the circumference

of a circle the "length", so we want to suggest that you make an appointment with your

teacher to get together, and review a few things that you're still not sure of.

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Q: How do you calculate the length of the circle?
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How do you calculate length of a circle?

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