Answer:
1008 cm²
Step-by-step explanation:
The triangular prism comprises:
- 2 congruent end triangles
- 3 different rectangles
Formulae
Area of a triangle = 1/2 × base × height
Area of a rectangle = width × length
Total surface area:
= 2 triangles + rectangle 1 + rectangle 2 + rectangle 3
= 2(1/2 × (9 + 5) × 12) + (15 × 20) + (13 × 20) + ((5 + 9) × 20)
= 2(1/2 × 14 × 12) + (15 × 20) + (13 × 20) + (14 × 20)
= 168 + 300 + 260 + 280
= 1008 cm²
