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Find surface Area & Volume of the regular pentagonal pyramid
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 one year ago
 one year ago
Find surface Area & Volume of the regular pentagonal pyramid > Click on Attachment
 one year ago
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MertsjBest ResponseYou've already chosen the best response.0
First find the area of the base. The formula is 1/2(perimeter)(apothem)
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Find that and tell me what you get.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Yes. That's what I got.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Not we have to find the area of one of those triangles and multiply by 5. I'll draw a picture. We know the base is 10.17 and the slant height is the height of the triangle.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Find the area of that triangle and multiply it by 5
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Is that one triangle or all 5?
 one year ago

richardlong369Best ResponseYou've already chosen the best response.0
5 would be 635.625
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Now add the area of the base that we calculated earlier. That should be the total surface area.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
What is the area of the base?
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
What is the area of the 5 triangles?
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
First find the area of the base. The formula is 1/2(perimeter)(apothem)12 minutes ago •Report Abuse Delete 99 Mertsj 0Find that and tell me what you get.11 minutes ago •Report Abuse Delete 43 richardlong369 Best Answer 0177.975
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
If you look back through the posts you will find the area of the base and the area of the 5 triangles. Add them together to get the total area.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
yes. That is the surface area.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Now the volume. Fortunately we are partly done with the volume because we already know the area of the base.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
So find that number. The area of the base. To find the volume multiply these 3 numbers: 1/3, the area of the base, and the height of the pyramid which is shown in the picture to be what?
 one year ago

richardlong369Best ResponseYou've already chosen the best response.0
i got 13361.486
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
That's the slant height. Look at the picture.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
The slant height is the height of the triangles that make the pyramid.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Yes. 1/3(24)=8 so multiply 8 times the area of the base. What do you get?
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
That's what I got as well. That would be m^3
 one year ago
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