Answer:21.4m^2
Step-by-step explanation:
surface area of triangular prism=2b+ph
b=area of triangular base
p=perimeter of base
h=height
area of triangular base=(2x1.7) ➗ 2
area of triangular base=3.4 ➗ 2
area of triangular base=1.7
perimeter of base=2+2+2
perimeter of base=6
height=3
Therefore surface area=2x1.7+6x3
surface area=3.4+18
surface area=21.4
