Jawaban dan Penjelasan dengan langkah-langkah:

1. panjang kerangka balok = 4 x (p + l + t) = 4 x ( 3+5+7) = 4 x 15 = 60 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (3 x 5 + 3 x 7 + 5 x 7) = 2 x (15 + 21 + 35) = 2 x 71 = 142 cm²

volume balok = p  x l x t = 3 x 5 x 7 = 105 cm³

2. panjang kerangka balok = 4 x (p + l + t) = 4 x (4+8+5) = 4 x 17 = 68 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (4 x 8 + 4 x 5 + 8 x 5) = 2 x (32 + 20 + 40) = 2 x 92 = 184 cm²

volume balok = p  x l x t = 4 x 8 x 5 = 160 cm³

3. panjang kerangka balok = 4 x (p + l + t) = 4 x (10+6+8) = 4 x 24 = 96 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (10x6+10x8+8x6) = 2 x (60 + 80 + 48) = 2 x 188 = 376 cm²

volume balok = p  x l x t = 10 x 6 x 8 = 480 cm³

4. panjang kerangka balok = 4 x (p + l + t) = 4 x (12+9+4) = 4 x 25 = 100 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (12x9+12x4+9x4) = 2 x (108 + 48 + 36) = 2 x 192 = 384 cm²

volume balok = p  x l x t = 12 x 9 x 4 = 432 cm³

5. panjang kerangka balok = 4 x (p + l + t) = 4 x (13+7+3) = 4 x 23 = 92 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (13x7+13x3+7x3) = 2 x (91 + 39 + 21) = 2 x 151 = 302 cm²

volume balok = p  x l x t = 13 x 7 x 3 = 273 cm³

6. panjang kerangka balok = 4 x (p + l + t) = 4 x (9+4+6) = 4 x 19 = 76 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (9x4+9x6+4x6) = 2 x (36 + 54 + 24) = 2 x 114 = 228 cm²

volume balok = p  x l x t = 9 x 4 x 6 = 216 cm³

7. panjang kerangka balok = 4 x (p+l+t) = 4 x (8+10+12) = 4 x 30 = 120 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (8x10+8x12+10x12) = 2 x (80 + 96 + 120) = 2 x 296 = 592 cm²

volume balok = p  x l x t = 8 x 10 x 12 = 960 cm³

8. panjang kerangka balok = 4 x (p + l + t) = 4 x (11+8+4) = 4 x 23 = 92 cm

luas permukaan balok = 2 x (p x l + p x t + l x t) = 2 x (11x8+11x4+8x4) = 2 x (88 + 44 + 32) = 2 x 164 = 328 cm²

volume balok = p  x l x t = 11 x 8 x 4 = 352 cm³