I assume the solid is a "regular hexagonal prism", by which it means that the cross section is a regular hexagon with all sides and angles equal. Also, the exact apothem is 9.5262... but we will adopt the given value of 9.5.
First lateral surface area A1=6*side length*height=6*11*20=1320 units Then the end areas A2=2 faces * 6 triangles/face * [base * height (apothem) /2] =2*6*11*9.5/2 =627 units
