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L = 2 . πr . (r + t)
= 2. (22/7 x 5 cm) . (5 cm + 14 cm)
= 2 . (15 5/7 cm) . (19 cm)
= 2. (298 4/7 cm²)
= 597 1/7 cm²
= 597,14 cm²
2. Luas selimut tabung :
L = 2 . π . r . t
= 2 . π . (1/2 . d) . t
= 2 . 22/7 . (1/2 . 28 cm) . 10 cm
= 2 . 22/7 . 14 cm . 10 cm
= 2 . 44 cm . 10 cm
= 2 . 440 cm²
= 880 cm²