Surface Area Growing Post , JerickR873

Ok this is my growing post for math , i will be showing yo what a rectangular prism , triangular prism , and a cylinder looks like and nets , also how to solve for Total Surface Area (TSA)

1st the Rectangular Prism

the formula for the rectangular prism is:
l x w = a

one way to find TSA for a rectangle is to find the area of the side , front , and top then you just times those by two because of their opposite side

Top

l x w = a
20 x 2 =a
40x2=ax2
80=ax2

Side
l x w = a
20 x 2 = a
40 x 2 = ax2
80 = a x 2

Front

l x w = a
20 x 20 = a
400 x 2 = a x2
800 = a x2

TSA = 800+80+80
TSA= 960 cm2

2nd is the Triangular Prism

Formula
b x h = a
l x w = a
I like to find all sides just like the rectangular prism and add up all the sides

Front
b x h = a
12 x 12 = a
144 x 2=a
288 = a x2

Bottom
l x w = a
12 x 5 = a
60 = a

Back
l x w = a
12 x 5 = a
60 = a

Top
l x w = a
1o x 5 = a
50 = a

TSA= 50 +60 + 60 + 288
TSA= 458 cm2

3rd the Cylinder

Formulas
d divided by 2 = r
pi R 2 = a
pi D = c
l x w = a

For cylinders , you need to find the area and circumference of a circle and times that by 2 , for the other end , and then for the rectangle its the circumference of the circle that is the width of the rectangle

pi D = C
3.14 x 15 = c
47.1 = c

d/2 = r
15/2=r
7.5= r

pi R 2 = a
3.14 x 7.5(2) = a
3.14 x 56.26 = a
176.67 x 2 = a
353.34= a

l x w = a
20 x 47.1 = a
942=a

942 + 353.54 =1295.34 cm2

Thanks YOU FOR READING MY POST

PLEASE COMMENT ON ANYTHING THAT I DID WRONG OR
THINGS I CAN DO BETTER