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richardlong369
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Find surface Area & Volume of the regular pentagonal pyramid
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 2 years ago
 2 years ago
richardlong369 Group Title
Find surface Area & Volume of the regular pentagonal pyramid > Click on Attachment
 2 years ago
 2 years ago

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Mertsj Group TitleBest ResponseYou've already chosen the best response.0
First find the area of the base. The formula is 1/2(perimeter)(apothem)
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
Find that and tell me what you get.
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
177.975
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
Yes. That's what I got.
 2 years ago

Mertsj Group TitleBest 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.
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
dw:1339278986157:dw
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
Find the area of that triangle and multiply it by 5
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
127.125
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
Is that one triangle or all 5?
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
5 would be 635.625
 2 years ago

Mertsj Group TitleBest 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.
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
SA = 762.75 ?
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
What is the area of the base?
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
50.85
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
i mean 635.625
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
What is the area of the 5 triangles?
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
635.625
 2 years ago

Mertsj Group TitleBest 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
 2 years ago

Mertsj Group TitleBest 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.
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
813.6
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
yes. That is the surface area.
 2 years ago

Mertsj Group TitleBest 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.
 2 years ago

Mertsj Group TitleBest 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?
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
i got 13361.486
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
What is the height?
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
That's the slant height. Look at the picture.
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
its 24
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
The slant height is the height of the triangles that make the pyramid.
 2 years ago

Mertsj Group TitleBest 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?
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
1423.8
 2 years ago

Mertsj Group TitleBest ResponseYou've already chosen the best response.0
That's what I got as well. That would be m^3
 2 years ago

richardlong369 Group TitleBest ResponseYou've already chosen the best response.0
thankyou
 2 years ago
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