Jawaban:

1.775,8125

Penjelasan dengan langkah-langkah:

A. Luas Tabung (a)

Rumus : 2 × π × r × ( r + t )

L = 2 × 22/7 × 8 × ( 8 + 30 )

= 2 × 22 × 0,875 × 38

= 38,5 × 38

= 1. 463 cm²

B. Luas Kerucut (b)

Rumus : π × r × ( r + s)

S (sisi miring) = √r² + t kerucut² = √8² + 2² = √64 + 4 = √68 = 8,25

L = 22/7 × 8 × ( 8 + 8,25 )

= 22 × 0,875 × 16,25

= 312,8125 cm²

C. Luas bangun ruang gabungan

Rumus : hasil a + hasil b

L = 1.463 + 312,8125

= 1.775,8125

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