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22 October, 10:41

Find the diameter and circumference of a circle with the radius of 13.1 km.

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  1. 22 October, 11:20
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    R = 13.1

    so

    diameter = 13.1 x 2 = 26.2 km

    circumference = 2 pi r = 26.2 pi km

    or

    circumference = 26.2 x 3.14 = 82.27 km
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