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Ljuring = 72/260 x 3,14 x 20 x 20
= 1/5 x 3,14 x 20 x 20
= 1/5 x 3,14 x 400
= 1/5 x 1256
= 251,2 cm,²
= 72/360. 3,14. 20. 20
= 1/5 . 3,14. 400
= 1/5 . 1256
= 251,2 cm"