Alvin's Surface Area Growing Post

This is my growing post

First off my rectangular prism:

This is my Net :

The formula I use to calculate the surface area of a rectangular prism is that first I find the area of all the faces, then I add up all the areas of the 6 faces. Thats how I get the surface area to my rectangular prism.

Now I'm going to solve it:

Top = A = LxW

A =6x2

A = 12 cm2

Side = A = LxW

A = 3x2
A = 6 cm2

Front = A = LxW

A = 6x3

A = 18 cm2

Now since I have the area of the 3 sides the other 3 sides are always equivalent so now I find TSA

TSA = side+side+front+back+top+bottom

TSA= 6+6+18+18+12+12

TSA = 72 cm2

My triangular prism:

Net For Triangular Prism:

To find the surface area for a triangle to me its like the rectangle but you have 5 sides and for the triangle faces you have to divide by 2 becuase its half a square.

Now I'm gonna solve it :

Front : A = LxW divided by 2

A = 5x4 divided by 2

A = 10 cm2

Side : A = LxW

A = 6x10

A = 20 cm2

Bottom : A = LxW

A = 4x10

A = 40 cm2

Now the 2 sides are the same because on this triangle they are equivalent.

Now for the TSA

TSA = side+side+bottom+front+back

TSA = 20+20+40+10+10

TSA = 100 cm2

Cylinder Prism:

Cylinder Prism Net :

To Find the surface area no a cylinder you can find the area of all the sides, but that takes to long for me so I just use a simple formula and then plug in the numbers ( 2 x pi x radius squared + pi x d x h). If you are given a radius then you must find the diameter first, and if your given a diameter you must find the radius.
First I'm gonna find the radius because I'm given the diameter.
R= diameter divided by 2
R= 4 divided by 2
R= 2cm
Now I'm gonna solve it :
TSA = 2 x pi x radius squared + pi x d x h
TSA = 2 x 3.14 x 4 + 3.14 x 4 x 6
TSA = 100.48 cm squared

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