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= 2 . 3,14 . 5 (5+16)
= 31,4 . 21
= 659,4
= 660 (b)
= 2 . 3,14. 5 (5+16)
= 10.3,14.21
= 210.3,14
= 659,4 cm
= 660 cm² (b)