Total surface area equals area of 5 rectangular faces + 2 pentagonal faces
Area of 5 rectangular faces


Area of 2 pentagonal faces can be found by drawing 5 isosceles triangles with height as shown in the diagram and multiply the result by 2.


The toatal surface area is

The correct answer is A
In similar triangles the angles equal each other an din this case
Answer:

Step-by-step explanation:
Given that:
at y = 0 , x = 1
Then:
Area = 
Area = 
Area = 
Then:



![\overline x = \dfrac{5}{3} \ [\dfrac{3}{8}x^{8/3}]^1_0](https://tex.z-dn.net/?f=%5Coverline%20x%20%3D%20%5Cdfrac%7B5%7D%7B3%7D%20%5C%20%5B%5Cdfrac%7B3%7D%7B8%7Dx%5E%7B8%2F3%7D%5D%5E1_0)


Similarly;







Thus; 
Answer: Please view the picture below
Step-by-step explanation:
This material should not be too difficult. Please study more. :)