Question

What is the volume of the pyramid in the diagram?
http://contentlaunch.ple.platoweb.com/testimagedb/c0/c0b7db11b1396518d70e9b00f1ba1d33


25 cm3

75 cm3

105 cm3

135 cm3

225 cm3

Answer 1

i need help with the question please help ill hold my end of the deal

Answer 2

Alright,
\[V=\frac{ lwh }{ 3 }\]
l and w represent sides of base
h represents height

Answer 3

That funky slant height is throwing me off.

Answer 4

yes i understand the formula but im bad at math

Answer 5

that what is throwing me off

Answer 6

do you know what the nine is. Is it h or l or w

Answer 7

If I ignore the slant height and follow the formula exactly, I get 25

Answer 8

Hang on

Answer 9

let me add everything up and see

Answer 10

Never mind, I still got 25

Answer 11

i add the slant and i got 135

Answer 12

Secondary formula:
\[V=\frac{ 1 }{ 3 }Bh\]
B represents area of Base
h represents height
still got 25

Answer 13

What did you use to get 135?

Answer 14

ok im getting three answer. there 135, 75, and 25

Answer 15

5 x 9 x 3

Answer 16

am i doing something wrong

Answer 17

The formula does not suggest 5 x 9 x 3
Both formula that I used resulted in 25

Answer 18

ok how about the 75

Answer 19

5 x 5 x 3 is that in the formula

Answer 20

yes, it is the formula. Now plug in the numbers and solve.

Answer 21

i did and got 75

Answer 22

then you got your answer. I dont know if its right because I dint look at the diagram.

Answer 23

No, the formulas were:
\[V=\frac{ lwh }{ 3 }\]
\[V=\frac{ (5)(5)(3) }{ (3) }\]
\[V=\frac{ 75 }{ 3 }\]\[\frac{ 75 }{ 3 }=25\]
Or,
\[V=\frac{ 1 }{ 3 }Bh\]\[V=\frac{ 1 }{ 3 }(25)(3)\]\[V=\frac{ 1 }{ 3 }75\]\[75 \times \frac{ 1 }{ 3 }=25\]

Answer 24

ok thanks

Answer 25

if its ok if i tag you in any question i have

Answer 26

its fine. You go ahead and do that.