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kompoz [17]
3 years ago
5

The circumference of a circle is 60 kilometers. What is its radius?

Mathematics
2 answers:
lisabon 2012 [21]3 years ago
6 0

Answer: 9.5493

Step-by-step explanation: circumference = 2pi*r

Aleksandr [31]3 years ago
3 0

Answer:

9.55 simplified

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We know that m∠D is 45° (by using the sum of interior angles in a triangle) so therefore, ΔDCE is a 45 - 45 - 90 triangle (the 45, 45, and 90 refer to the angle measures). The ratio of sides in a 45 - 45 - 90 triangle is 1 : 1 : √2 where the 1s are the sides and the √2 is the hypotenuse. We need to solve for x in x : x : √22. If you notice that √22 = √2 * √11, we can use this to find x, therefore, x = 1 * √11 = √11 so CD = √11 and CE = √11.

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