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r lingkaran besar disebut r2
L perm = L tutup tabung + L selimut tabung + (L lingkaran besar - L alas tabung)
L perm = (phi × r1 × r1) + (2 × phi × r1 × t) + (phi × r2 × r2) - (phi × r1 × r1)
L perm = (2 × phi × r1 × t) + (phi × r2 × r2)
L perm = phi [(2 × r1 × t) + (r2 × r2)]
L perm = phi [(2 × 10,5 × 20) + (28 × 28)]
L perm = phi (420 + 784)
L perm = (22/7) × 1204
L perm = 3784 cm2