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For the given question

Area of rectangle

R

R

Area of 2 triangles =2( ½ HxB) = 2(1/2x9x12) = 108 cm

Surface area of the isosceles triangular prism.

= R

= 216 + 180 + 108 = 504 cm

For the given question

Volume of a triangular prism = ½ x base x height x length

Since this is a equilateral triangular all the sides will be equal therefore base = side

= ½ x B x H x L

= ½ x 8 x 4 x 9

= 144 cm

Volume of the triangular prism = 144 cm