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Write this ratio in its simplest form: the ratio of the circumference of a circle to its radius.
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Our ratio is circumference to radius.
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The circumference in terms of the radius is equal to two times the radius times 𝜋.
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The radius is then equal to 𝑟.
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With this ratio, we notice that we have an 𝑟 on either side.
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Imagine that we divide both sides of our ratio by the radius.
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On the left, it would cancel out, leaving us with two 𝜋.
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On the a right, we would have radius divided by radius, 𝑟 over 𝑟.
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We would then simplify that value to one.
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In its simplest form, the ratio of the circumference of a circle to its radius is two 𝜋 to one.
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For every one unit of radius, there is two 𝜋 units in the circumference.