eroshea
Find the volume of a regular tetrahedron whose altitude measures 10 cm.



This Question is Closed

hartnn
Best Response
You've already chosen the best response.
1
the formula is
V = \(\sqrt 2\)/12 * a^3

eroshea
Best Response
You've already chosen the best response.
2
it is not the edge that is given but the ALTITUDE..

eroshea
Best Response
You've already chosen the best response.
2
now i got it.. :))

Miyuru
Best Response
You've already chosen the best response.
0
How ?

eroshea
Best Response
You've already chosen the best response.
2
altitude = root(2/3) * a
10 = root(2/3) * a
100=2/3 a^2
a= 5 root 6
V = root(2)/12 * a^3
V = 216.5

Miyuru
Best Response
You've already chosen the best response.
0
I thought it like this..\[\large\color{green}{x=\frac{100}{\sqrt{3}}}\]
dw:1353600894733:dw

Miyuru
Best Response
You've already chosen the best response.
0
Sorry..\[\large\color{green}{x=\frac{10}{\sqrt{3}}}\]

eroshea
Best Response
You've already chosen the best response.
2
that's fine.. ^^

Miyuru
Best Response
You've already chosen the best response.
0
;)

Miyuru
Best Response
You've already chosen the best response.
0
@eroshea I am glad tht u got it..:D :)

eroshea
Best Response
You've already chosen the best response.
2
thanks for your help @hartnn and @Miyuru ^^

Miyuru
Best Response
You've already chosen the best response.
0
I didn't help.. o.O

Miyuru
Best Response
You've already chosen the best response.
0
Thank @hartnn ONLY

eroshea
Best Response
You've already chosen the best response.
2
well, you tried helping me.. so thanks :))

hartnn
Best Response
You've already chosen the best response.
1
u got it on your own, @eroshea :)

Miyuru
Best Response
You've already chosen the best response.
0
Is my way wrong @hartnn

hartnn
Best Response
You've already chosen the best response.
1
if u got the same volume, then u are correct.

Miyuru
Best Response
You've already chosen the best response.
0
It's nearly 181.4 :(

hartnn
Best Response
You've already chosen the best response.
1
then incorrect :P

Miyuru
Best Response
You've already chosen the best response.
0
:D

eroshea
Best Response
You've already chosen the best response.
2
:D

Miyuru
Best Response
You've already chosen the best response.
0
OHH Anyway thnks for U all and Welcome...

Miyuru
Best Response
You've already chosen the best response.
0
Ohh @eroshea you mean the height is 10.. Isn't it ?

eroshea
Best Response
You've already chosen the best response.
2
yes

Miyuru
Best Response
You've already chosen the best response.
0
I thought it was the altitude of a triangle.. :P

eroshea
Best Response
You've already chosen the best response.
2
no.. it's the height of the tetrahedron

Miyuru
Best Response
You've already chosen the best response.
0
Ok got it.. :) Then your way is correct. :D

eroshea
Best Response
You've already chosen the best response.
2
yep :D

kneenutskii
Best Response
You've already chosen the best response.
0
what is the figure and where did 2/3 came from?