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= 1/2 × 8 × 6 × 20
= 1 × 8 × 6 × 10
= 480 cm³ (B)
11) L. Selimut = 2Πrt
660 = 2 . 22/7 . r . 20
660 = 880/7 . r
r = 660 : 880/7
r = 660 × 7/880
r = 3 × 7/4
r = 3 × 1,75
r = 5,25 (B)