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antoniya [11.8K]
2 years ago
12

Please help see picture

Mathematics
1 answer:
Otrada [13]2 years ago
5 0

Answer:

688 cm²

Explanation:

Area of triangular prism = Base × Height + Length × (perimeter of base)

Here given:

  • Base: 6 cm
  • Height: 12 cm
  • Length: 20 cm
  • Perimeter of Base: (6 + 12.4 + 12.4) = 30.8 cm

============================================

Surface Area = 6 × 12 + 20 × (30.8) = 688 cm²

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