Answer:
part 1) [tex]SA=1,146\ cm^2[/tex]
part 2) [tex]SA=4,120\ mm^2[/tex]
Step-by-step explanation:
part 1) we know that
The surface area of the figure is equal to the area of all the faces of the figure
so
[tex]SA=2[(12(9)+(5)(18-9)]+2[(12)(14)]+2[(14)(18)][/tex]
[tex]SA=306+336+504[/tex]
[tex]SA=1,146\ cm^2[/tex]
part 2) we know that
The surface area of the figure is equal to the area of all the faces of the figure
so
[tex]SA=2[(50)(30)-(50-24)(15)]+2[(10)(30)]+2[(50)(10)]+2[(10)(15)][/tex]
[tex]SA=2,220+600+1,000+300[/tex]
[tex]SA=4,120\ mm^2[/tex]
