Answer:
336cm2
Explanation:
The diagram is divided ninto 5 parts that is rectangles ABCD, CHGD, GFEH and triangles CIH and DGJ.
Area of rectangle ABCD= lxb
=12x6=72cm2
Area rectangle CDHG=lxb
12x8=96cm2
Area rectangle HGFE= lxb
=10x12=120cm2
Area of triangles CIH and DIG= 2x1/2xbxh
=6x8=48cm2
Surface area of the triangular prism=Area of rectangle ABCD+Area rectangle CDHG+Area rectangle HGFE+Area of triangles CIH and DIG
72+96+120+48=336cm2