Answer:
L = 324 cm²
S = 359.1 cm²
Step-by-step explanation:
Lateral surface area of a triangular prism is given by,
Lateral surface area = Perimeter of the triangular base × Height
= (9 + 9 + 9)×12
= 27 × 12
= 324 cm²
Surface area area of the triangular prism = Lateral area of the prism + Area of the triangular bases
= 324 + [tex]\frac{1}{2}(Base)(Height)[/tex]
= 324 + [tex]\frac{1}{2}(9)(7.8)[/tex]
= 324 + 35.1
= 359.1 cm²
