# Thread: :Smack:

1. ## :Smack:

I'm havin' sum trouble. see attachments, i really don't know how to do them.

Questions: Calculate the volume of each shape. Show all Workin'

2. For the first one just use the formula $\frac{1}{3}bh$ and for the second try breaking it into two rectangular prisms find the area of each of them and add them together.

3. yer i know this would be pretty easy for you but i'm not sure what formula to use!

4. how exactly do i do the 1/3bh formula??

5. Originally Posted by Sah-raa
how exactly do i do the 1/3bh formula??
the formula for volume is: $V = \frac 13 (\mbox{ Area of base })(\mbox { height })$

the base in the first question is a square. you do know how to find the area of a square, right?

6. Originally Posted by Sah-raa
I'm havin' sum trouble. see attachments, i really don't know how to do them.

Questions: Calculate the volume of each shape. Show all Workin'
for maths5

alter the diagram as you see below. now find the volume of each box, that is V = length*width*height (note that the height of the big block is 7cm

7. Originally Posted by Sah-raa
yer i know this would be pretty easy for you but i'm not sure what formula to use!
for math6. i suppose you want to find the area. modify the diagram as you see below and find the area of each rectangle. for a rectangle, A = length*width

8. to find the area of a square it would be length x width right?

9. for the 2nd one, how do you know the the height for the larger one is 7 cm?

10. Originally Posted by Sah-raa
to find the area of a square it would be length x width right?
yes

11. Oh yer i have it, so with that info, i've got this: v = length x width x height
= 7 x 12 x 20 x 12 x 20 x 7 x 12
is that right, please tell me if i'm gettin' something wrong!

12. Originally Posted by Sah-raa
for the 2nd one, how do you know the the height for the larger one is 7 cm?
the length of the big block above the small block is 4 cm, the small block is 3 cm high. so the height of the big block is 3 + 4 = 7cm high

Originally Posted by Sah-raa
Oh yer i have it, so with that info, i've got this: v = length x width x height
= 7 x 12 x 20 x 12 x 20 x 7 x 12
is that right, please tell me if i'm gettin' something wrong!
what question is that for? anyway, it doesn't matter, that is almost certainly wrong. i don't think any of the problems should be worked out like that. in your formula you have 3 things being multiplied, yet you have 6 multiplication signs, that should tell you that you're doing something wrong

13. ok so would it be 7 x the length of the larger one? how will i be able to find the length?

14. Calculate the value of AC correct to one decimal place. All measurements are in centimetres.

for the first one, would i go 15 x 12? to find the value of AC? and the same as the snd?

15. Originally Posted by Sah-raa
Calculate the value of AC correct to one decimal place. All measurements are in centimetres.

for the first one, would i go 15 x 12? to find the value of AC? and the same as the snd?
i do not know what question you are referring to here. you asked two questions on volume and one on area, where is this from?

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