Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is r if c c' = 5 and d' = 20?

Step-by-step explanation:

We know that:

So, the ratio between the circumferences is 4 and the diameter of the second circle is 20. In this case, we have to use the ratio between those two circumferences, because that's what is our given data.

From this proportion, we deduct that the diameter of the initial circle is 100. Now, we know that the radius in a circumference is have the diameter. Therefore, the radius is:

1/3 + 1/5 = 8/15.

step-by-step explanation:

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