Question

http://prntscr.com/b6x5p6
7 I got v=414.7
http://prntscr.com/b6x5ug
9 I got
V=123 in terms of pi
SA=81 in terms of pi
http://prntscr.com/b6x62n
6 I got 48
http://prntscr.com/b6x6hf
4. I got LA=28 terms of pi and SA=36 in terms of pi

Are these correct?

Answer 1

@jim_thompson5910

Answer 2

As for the two questions I need help with, here they are.
http://prntscr.com/b6x6q5

Answer 3

what is the volume of the first one without the roof?

Answer 4

Wouldn't it be 14x35x8?

Answer 5

The answer you got for #7 is incorrect

Answer 6

correct, now what is the area of a triangle?

Answer 7

@jim_thompson5910

That's the only one? If so, what did I do wrong?

@zzr0ck3r

Well, I know the base is 14, but I'm not too sure how to find the height.

Answer 8

well how tall is the building and how tall is it when you remove the roof? What is the difference?

Answer 9

I haven't checked the others yet. Please only post one question per thread. To avoid confusion and clutter

Answer 10

Sorry haha. I figured it would be easier this way. No problem, though.

Answer 11

@Kikuo do you see the height of the triangle must be 2?

Answer 12

No, I don't.

Answer 13

It's hard to see from the diagram... but perhaps they mean the diagonal is 10 feet? Just an idea...

Answer 14

Oh hi there! Hold on let me look.

Answer 15

I thought it meant the height was 10

Answer 16

Has your class covered the Pythagorean theorem? Like a^2 + b^2 = c^2? If you haven't then just ignore my idea. : )

Answer 17

so the triangle height is 2 so we have (1/2)2*14+14*8*35

Answer 18

Yes!

That sounds like the easiest way. I assume I use that to find the height. : )

Answer 19

Question, where did the 14x8x35 come from?

I assume that's the full volume, yes?

Answer 20

err (1/2)2*35*14+14*8*35

Answer 21

I'm a bit confused about what you're doing. Though, I did get the answer as you did for the height.

Answer 22

yeah maybe ignore me, I was reading the thing wrong I think

Answer 23

Alright, so what do we do?

Answer 24

@zzr0ck3r

Answer 25

depends on what 10 is. I can't tell from the picture.

Answer 26

Ten is the side of the base
@zzr0ck3r

Answer 27

6,7 and 9(V) are wrong.

Answer 28

@Sachintha

4 is correct?

What did I do wrong for the other ones?

Answer 29

Yes 4 is correct. 9(V) should be 121.5 so it's 122. For the rest you seem to have the formula wrong.

Answer 30

6. Volume of square pyramid = \(\large a^2\Large\frac{h}{3}\)

7. Volume of cone = \(\large\pi r^2\Large\frac{h}{3}\)

Answer 31

For 8, find the area of the gable wall and multiply with the length of the house to get the volume of it.
For 10, get r for the SA and substitute it for formula of volume.

\(\large49\pi=4\pi r^2\)
\(\large\quad\; r =\Large\frac{7}{2}\)

\(\begin{array}{ccc}\therefore &Volume~of~sphere &=&\Large\frac{4}{3}\pi r^2\\&&=&\Large\frac{4}{3}\pi(\frac{7}{2})\end{array}\)