What is the surface area and volume of all the parts of the castle?

N 1 FRONT LEFT TOWER

[surface area of a prism]=[area of the base]+perimeter*h> only one base
[surface area of a prism]=[3*3]+[4*3]*50> 609 units²

[surface area of a triangular pyramid]=[area of the 4 triangles]> without base
[area of 1 triangle]=3*h/2
h²=3²+1.5²> h²=11.25> h=√11.25 units
[area of 1 triangle]=3*√11.25/2> 5.03 units²
[surface area of a triangular pyramid]=[4*5.03]> 20.12 units²

surface area of the front left tower=609+20.12> 629.12 units²

[volume of a prism]=[3*3*50]=450 units³
volume of a triangular pyramid]=[area of the base]*h/3
volume of a triangular pyramid]=[3*3]*3/3> 9 units³

[volume of the front left tower]=450+9> 459 units³

N 2 FRONT RIGHT TOWER

[surface area of a cylinder]=[area of the base]+perimeter*h--> only one base
[surface area of a cylinder]=[pi*3²]+[2*pi*50]--> 342.26 units²

[surface area of a cone]=pi*r*l> without base
r=3 units
l²=r²+h²> 3²+3²> 18> l=√18 units
[surface area of a cone]=pi*3*√18> 39.97 units²

surface area of the front right tower=342.26+39.97> 382.23 units²

[volume of a cylinder]=pi*r²*h
[volume of a cylinder]=pi*3²*50> 1413 units³

[volume of a cone]=pi*r²*h/3
[volume of a cone]=pi*3²*3/3> 28.26 units ³

[volume of the front right tower]=1413+28.26> 1441.26 units³

N 3 BACK LEFT TOWER
[surface area of a cylinder]=[area of the base]+perimeter*h--> only one base
[surface area of a cylinder]=[pi*3²]+[2*pi*50]--> 342.26 units²

[surface area of hemisphere]=2*pi*r²
[surface area of hemisphere]=2*pi*3²> 56.52 units²

surface area of the back left tower=342.26+56.52> 113.04 units²

[volume of a cylinder]=pi*r²*h
[volume of a cylinder]=pi*3²*50> 1413 units³

[volume of a hemisphere]=(4/6)*pi*r³
[volume of a hemisphere]=(4/6)*pi*3³> 56.52 units³

[volume of the back left tower]=1413+56.52> 1469.52 units³

N 4 BACK RIGHT TOWER
[surface area of a triangular prism]=[area of the base]+perimeter*h> only one base

find the area of the base
h²=3²-1.5²> h=√6.75
[area of the base]=3*√6.75/2> 3.90 units²
[surface area of a triangular prism]=[3.90]+[3*3*50]> 453.9 units²

[surface area of a triangular pyramid]=[area of the 3 triangles]> without base
[area of 1 triangle]=3*h/2
h²=3²+1.5²> h²=11.25> h=√11.25 units
[area of 1 triangle]=3*√11.25/2> 5.03 units²
[surface area of a triangular pyramid]=[3*5.03]> 15.09 units²

surface area of the back right tower=453.9+15.09> 468.99 units²

[volume of a triangular prism]=area of the base *height
find the area of the base
h²=3²-1.5²> h=√6.75
[area of the base]=3*√6.75/2> 3.90 units²
[volume of a triangular prism]= 3.90*50> 195 units³

volume of a triangular pyramid]=[area of the base]*h/3
volume of a triangular pyramid]=[3.90]*3/3> 3.90 units³

[volume of the back right tower]=195+3.90> 198.90 units³

N 5 CENTRAL BUILDING

[surface area]=2*[area of the base]+perimeter of the base *heigth
[surface area]=100*50*2+2*(150)*30> 10000+9000> 19000 units²

surface area of the central building=19000 units²

volume of the central building =100*50*30> 150000 units³

volume  of the central building=150000 units³

N 6
total surface area=629.12+382.23+113.04+468.99+19000> 20593.38 unit²
total volume=459+1441.26+1469.52+198.90+150000> 153568.68 units³

The answer would be: b