hitunglah luas permukaan dari masing masing prisma tersebut

C. Luas alas = A × t ÷ 2

= 18 × 12 ÷ 2

= 18 × 6

= 108 cm^2


keliling alas = 12 + 18 + 35

= 65 cm


L.permukaan = (2 × luas alas) + (keliling alas × T)

= (2 × 108) + (65 × 35)

= 216 + 2.275

= 2.491 cm^2



D. L. permukaan = 2 × (p×l + p×t + l×t)

= 2 × (8×6 + 8×15 + 6×15)

= 2 × (48 + 120 + 90)

= 2 × 258

= 516 cm^2