At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
Surface area = 200 cm^2 can anyone see if this is right?
apothem is the face height and not the pyramid height right?
what is AB mean?
prolly height of pyrimaid
apothem is a line segment from the center of the polygon perpendicular to one of its sides.... AB is ... A is the tip of the pyramid... to the base.. an edge of a side
B is on the bottom
pentagonal 5 sides
8*5.5*5 is side areas, do we include the bottom as well?
l^2 = (5.5)^2 + (4)^2 l = sqrt 5.5^2 + 4^2 sqrt yea... I think I did
sqrt 30.25 + 16 sqrt 46.25 p = 6.8 1/2(40)(6.8) + 8^2 = 200
sqrt((4^2) + (5.5^2)) = 6.80073525 doesnt = 10 sqrt((8^2) + (5.5^2)) = 9.7.... is close to 10 If the edge AB that runs slong the side is 10, that means the base is 16
8 * 5 * 5.5 = 220 for sides areas .... but to include the base we'd have to do some more calculations
ok well its just asking for the surface area.... LA + B
ha oh boy
16^2 = 2s^2 -2s^2 cos(74) 16^2 = s^2(2-2cos(74)) 16^2 -------- = s^2 2-2cos(74) Area in red = (s^2 sin(74))/2
oh wow... so um... tell me you get 200 LOL
:) I get about 85 there ... if I did it right but *5 gotta chk it again make sure I aint messed it up
hah!! i had 72 but used 74 lol .....
ok I'll check again too... good eye
I get abt 440.5 for the bottom area that way
i wonder if there is a calculator to find the area... let me investigate LOL
16/2 = 8 8 * 8tan(54) = area of red tri 5* area red tri = area base
220 215.6 ------- 435.6 abt for the surface areas
hey whats the side length, and what is the slant length
is 10 slant and 8 side
the side length of the pyramid is 10; and the slant is 5.5
that 215.6 is off
I thought the apothem was 5.5
aint that the slant?
http://www.wolframalpha.com/input/?i=area+pentagon+side+%3D16 I keep coming to 440.442 as area of base
the calculator is asking for apothem length side length slant length enter height
http://easycalculation.com/area/pyramid.php pentagonal pyramid
5.5 16 10 is what I used
Sa = 620 .... 220 440.5 ------ so we are close 660.5
edge base length is what I cant be to sure about; how do you describe that?
ha your awesome.... hey it says round to the nearest tenth unit...
the edge where the number is in my book LOL on AB?
thats my lingo... lol
I was trying to describe whatever you were asking
if I got the 8 in the right place... then im good to go
the 8s are at the bottom of base of the pyramid
yes; the red is just a reflection into the base under the pyramid
where alll the edges meet and creat the pentagonal base
A is the top of the pyramid.... and B is at the bottom with the 8s
AB is a side of one of them triangles
well there it is!!! yep looks just like it LOL
then: Sa = 5(face area) + 5(redbase area) Sa = 5(5.5*16/2) + 5(8*8tan(54)/2) Sa = 660.442
we got a way to verify this?
yea that calulator if I know the right numbers
I dunno... I'm going with what you did!
ive been trying to define apothem, slant heaight, and all that stuff; but nothing is consistant. apothem of a pyramid most likely means the height of a face; slant height also means distance up the face; so I cant seem to determine what any of it really means..
85.8253 slnat height is 10? and sides are 5
do you know how to do a screenshot?
do you see the "PrtScrn" key that you never use up there with the "pause", and "scroll lock" keys? press it
now open up your 'paint' program and hit your 'ctrl + v' keys to paste it. and let me know if it worked
save it to your desktop as a jpeg and attach it to this post
is that what you wanted?
yep; now do that to the screen that has the problem on it :)
the problem is is in my book
can you take a picture of it? and put it on the computer? maybe a scanner?
ok hang on
is that what you wanted LOL
the apothem of the pentagon is 5.5 ; thats the length from the center of the base out to the base edge... much better
just an FYI regular pyramid formula is LA + B Yes , i thought I told you that :)
I still get 200
Sa = 5(8*sqrt(10^2+4^2)/2) + 5(8*5.5/2) Sa = 5(4*sqrt(116)) + 5(4*5.5) Sa = 20sqrt(116) + 20(5.5) Sa = 325.406592 ....
what did we determine the slant length is
the slant length is the missing leg of the right tri formed by half the base and a hyp of 10 sh^2 + 4^2 = 10^2 sh = sqrt(100 - 16) .. doh!! I added
Sa = 293.303
is side 10 or 8?
height should be abt 7.331
side is the top of pyramid AB 10 no??? whats 8? base I dunno
who ever invented math is wasting valuable life time for me!!! :(
... the base of this thing is abt 110.1111
thats the perimeter of the base... 5(8) = 40 I thought
183.303 is the lateral area 110.111 -------- 293.414
Ok I give up on this one... I am taking your word!
you have some neat sites
when I think I understand .... I DONT!!!
:) thnx take a break, and get aome air
I gotta drive up to the veranda and setup for my laptop; librarys closing...
ok ... I need to review... take my notes... and on to the next.. LOL Thank you
I'll be here!!