Kathleen's Surface Area Growing Post

Rectangular Prism :


Net :

Formula:

• l x w = a
• # x # = a
  
• #cm(2) = a

TSA
= S1 + S2 + S3
= # + # + #
= #cm(2)


Solution:




Triangular Prism:


Net:

Formula:
- Rectangles.

• l x w = a
• # x # = a
  
• #cm(2) = a
  

- Triangles.

• b x h / 2 = a
• # x # / 2 = a
  
• # / 2 = a
  
• #cm(2) = a
  

TSA = S1 + S2 + S3 + S4 + S5
= # + # + # + # + # = #cm(2)


Solution:




Cylinder:



Net:


Formula: First, we need to find the circumference of the circle to get the length of the rectangle.

• πd = C
• 3.14 x # = C
• # = C

Next, we have to find the area of the circle.
- If we were given the diameter of the circle, we have to find the radius.

• d / 2 = r
• # / 2 = r
• # = r

- The area of the circle.

• π x r x r = A
• 3.14 x # x # = A
• #cm (2) = A

Now, we must find the Lateral Area.

• L x W = L.A
• # x # = L.A
• #cm = L.A

* The length is the circumference of the circle.


TSA = circle + circle + L.A = # + # + # = #cm (2)



Solution:




Video: