Question

6.) Find the surface area of the regular pyramid shown to the nearest whole number. The figure is not drawn to scale. http://assets.openstudy.com/updates/attachments/55bff878e4b03325500374c7-lollygirl217-1438647128464-as.jpg

my answer: 1,125 m^2. is that correct?

7.) What is the surface area of a conical grain storage tank that has a height of 37 meters and a diameter of 16 metes? Round the answer to the nearest square meter.

my answer: 1152 square meters.

Answer 1

is that correct?

Answer 2

@Abhisar

Answer 3

@triciaal

Answer 4

@nincompoop

Answer 5

@Zale101

Answer 6

@midhun.madhu1987

Answer 7

@sleepyjess

Answer 8

@Miracrown @ganeshie8

Answer 9

@taramgrant0543664 @Jaynator495

Answer 10

@sugarplum15

Answer 11

@Zale101 is it right? is it WRONG??

Answer 12

@ganeshie8 @Abhisar

Answer 13

@UnkleRhaukus

Answer 14

@.Sam.

Answer 15

What did you get for the base of the pyramid?,
and what did you get for the area of each of the triangular faces?

Answer 16

hold on.

Answer 17

gane just messaged me saying i was right. 6) The area of the base is 6*(15 m)*(7.5√3 m) = 675√3 m^2 ≈ 1169 m^2
.. The lateral area is 3*(15 m)*(12 m) = 540 m^2
.. The total area of base and sides is 1709 m^2.

7) The area of the base is π*(8 m)^2 = 64π m^2 ≈ 201 m^2
.. The lateral area is π(8 m)*√(37^2 + 8^2) m = 951 m^2
.. The total area of base and side surface is 1152 m^2.

Answer 18

oh...well the first one was not one of my options so I just went with the answer closest to it.

Answer 19

you have the lateral surface area correct

Answer 20

but what formula are you using to calculate the area of the hexagonal base?

Answer 21

don't forget the area of a triangle is bh/2

Answer 22

(you forgot to divide by 2)

Answer 23

so 647m^2?

Answer 24

er hold on

Answer 25

540 m^2

Answer 26

Area of whole thing\[A=\frac{ 3\sqrt{3} }{ 2 }a^2\]
then divide by 6...

Answer 27

The surface area of the pyramid is the sum of the area of its base, plus its lateral surface area

The base can be decomposed into six triangles

Area of base = 6 * (15m) * (7.5√3m) /2
= 1169/2 m^2
= .... m^2

Lateral area = 3*(15 m)*(12 m) = 540 m^2



The total surface area

Area of base + Lateral area
= .... m^2 + 540 m^2
= ( ) m^2

Answer 28

http://openstudy.com/study#/updates/55c038dae4b0332550038575

Answer 29

just to confirm YOU ARE telling me that I am correct on number 7 but not 6? I could have gotten mixed up

Answer 30

i never crunched the numbers,

Answer 31

...guys I am not fishing for answers I just want you to tell me if I am right or not.

Answer 32

Yes. No. That is all.

Answer 33

OpenStudy isn't like that.

Answer 34

Thank you.

Answer 35

Actually it is, I have been getting corrected of my work since I got here. I havent come across this problem before until now. I don't know what you guys are talking about.

Answer 36

i dont have a calculator with me now but i can see the answer is >1000

Answer 37

It isn't cheating when you are just simply asking someone if you did something correctly. Pretty much all of you guys with 99 points have been coming in and correcting me no problem. @UnkleRhaukus and @Jhannybean are the only ones who are treating it differently.

Answer 38

Nevertheless, I will still award unkle.

Answer 39

Because we are not solving your problem on our own and telling you whether you are right or wrong is wasting your time? Crunch the numbers yourself with the guidance we gave you and you yourself will see whether it's right or wrong. It's not difficult at all.

Answer 40

But I am only looking for a simple yes or no. You two are overthinking this.

Answer 41

I havent had any problems with any other users

Answer 42

@Jhannybean

Answer 43

i want you to learn geometry

Answer 44

The thing is, is that I already know it, i already solved the problem but I just want to KNOW IF I did it correctly.

Answer 45

Then you've got to show us your work.

Answer 46

I already did...lol

Answer 47

you forgot to divide by two, like i said before

Answer 48

You said one before.

Answer 49

Anyways, gane already said i did them right.

Answer 50

gane could be wrong

Answer 51

I'm sorry but he has corrected my work before and he was right every time.....because he is an honorary professor.