The volume of air contained in the shed is 1128 m³
The surface area of the shed is 555.42 m²
How to find the volume
The volume is solved by splitting the structure and solving for the volume of the individual sections. Then we add together
Volume of the section
= volume of half cylinder + volume of cuboid
= 1/2 π r² h + h * w * l
= (1/2 * π * 3.5² * 15) + (15 * 8 * 7)
= 288.634 + 840
= 1128.634
= 1128 m³
Internal surface area
= (π r h + π r²) + 2(l * w + h* l)
= (π * 3.5 * 15 + π * 3.5²) + 2(8 * 7 + 15* 8)
= 203.42 + 352
= 555.42 m²