The surface area of the pentagonal prism is given by:
SA=2[area of the pentagonal sides]+5[area of rectangle sides]
Area of pentagonal side will be given by:
Area=5/2 sa
where;
side,s=8
apothem ,a=5.5
hence;
Area=5/2*8*5.5=110 sq units
Area of rectangular side will be:
Area=length*width
=20*8=160 sq units
therefore the surface area (SA) will be:
SA=110*2+5*160
=1,020 sq. units
