luas permukaan prisma tersebut adalah

Luas permukaan prisma = Total semua alas sisi

[tex]l1 = 2 \times \frac{(10 + 20)12}{2} = 360 \\ l2 = 2 \times 13 \times 12 = 312 \\ l3 = 10 \times 12 = 120 \\ l4 = 20 \times 12 = 240 \\ \\ L \: total \: = l1 + l2 + l3 + l4 \\ L \: total \: = 360 + 312 + 120 + 240 \\ L \: total \: = 1032 \: {cm}^{2}[/tex]

tinggi alas....?
(20-10) :2 =5
t = √13² - 5² =√169 -25=√144 =12cm
Luas permukaan....?
=[2x1/2(10+20)12] + [(13x12) +(13x12) + (20x12)] + (10 x 12)
= 30 x 12 + 156 + 156 + 240+120
= 360 + 156 +156 +240 +120
= 1.032 cm²