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

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

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

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0Not 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.

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

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

richardlong369
 3 years ago
Best ResponseYou've already chosen the best response.05 would be 635.625

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0Now add the area of the base that we calculated earlier. That should be the total surface area.

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0What is the area of the base?

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

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0First 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

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0If 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.

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0yes. That is the surface area.

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0Now the volume. Fortunately we are partly done with the volume because we already know the area of the base.

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0So 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?

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

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

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

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