Jawaban:

1. A

2. C

Penjelasan dengan langkah-langkah:

Diketahui:

Tinggi total = 32 cm

Tinggi Limas = 32 - 12 = 20 cm

Tinggi balok = 12 cm

Panjang balok = 15 cm

Lebar balok = 8 cm

V. Limas = 1/3 x Luas Alas x Tinggi

= 1/3 x (p x l) x t

= 1/3 x (15 cm x 8 cm) x 20 cm

= 1/3 x 120 cm x 20 cm

= 2.400 cm

3

= 800 cm³

V. Balok = p x l x t

= 15 cm x 8 cm x 12 cm

= 1.440 cm³

V. total = 800 cm³ + 1.440 cm³

= 2.240 cm³ (A)

Diketahui :

S = 40 cm

r = 20

Luas permukaan ½ bola = 2πr²

= 2 x 3.14 x 20²

= 2.512 cm²

Luas permukaan balok = 6.s²

= 6 x 40²

= 6 x 1.600

= 9.600 cm²

Luas permukaan total

= 2.512 cm² + 9.600 cm²

= 12.112 cm² (C)