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t = 25
L .tabung= 2x 22 x 7 ( 7 + 25)
7
= 44 (32)
= 1408 cm²
= 7
Lp = 2(La) + (k x t)
= 2(phi x r²) + (2 x phi x r x t)
= 2 ( 22/7 x 7x 7) + ( 2x 22/7 x7 x 25)
= 2 ( 154 ) + ( 44 x 25)
= 308 + 1100
= 1408 cm²