Jawaban:

Langkah:

2. Lp. balok = 2 × ( p + l ) + ( p × t ) + ( l × t )

= 2 × ( 25 × 14 ) + ( 25 × 10 ) + ( 14 × 10 )

= 2 × ( 350 + 250 + 140 )

= 2 × 740

= 1.480 cm²

Jadi luas permukaan bangun ruang pada gambar adalah 1.480 cm²

3. V. Balok = p × l × t

= 25 × 14 × 10

= 3.500 cm³

Jadi volume bangun ruang pada gambar adalah 3.500 cm³

4. Lp Limas = 2 × ½ × 40 × 25 + 2 × ½ × 18 × 25

= 1.000 + 450

= 1.450 cm²

Lp Balok = 2 × ( 40 × 15 ) + 2 × ( 18 × 15 ) + 40 × 18

= 1.200 + 540 + 720

= 2.460 cm²

Lp Gabungan = 1.450 + 2.460 = 3.910 cm²

5. V. Balok kecil = p × l × t

= 26 × 12 × 7

= 2.184 cm³

V. Balok besar = p × l × t

= 36 × 12 × 14

= 6.048 cm³

V. Gabungan = 2.184 + 6.046 = 8.232 cm³

6. ----- Maap nggak tau ------

7. = ( 70 + 108 + 111 + 76 ) ÷ 10

= 365 ÷ 10 = 36,5

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