k = 2 x π x r
= 2 x 22/7 x 21
=2 x 22 x 3
= 44x 3
= 132
132 x 2500 = 330000
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S = 132 . 2.500 = 330.000 cm = 3.300 m = 3,3 km
k = 2 x π x r
= 2 x 22/7 x 21
=2 x 22 x 3
= 44x 3
= 132
132 x 2500 = 330000