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luas permukaan besar
= 2 x phi x r ( r + t )
= 2 x 22/7 x 7 ( 7 + 5)
= 44 x 12
= 528 cm²
===>>>
luas permukaan kecil
= 2 x phi x r ( r + t )
= 2 x 22/7 x 3,5 ( 3,5 + 5 )
= 22 x 8,5
= 187 cm²
===>>>
luas permukaan total = 528 + 187 = 715 cm²
semoga membantu ^_^