# Thread: my ans n given ans not same .. y?

1. ## my ans n given ans not same .. y?

my ans for (a)i ---> 236cm cube.
the given ans is ---> 240 cm cube ?
hu is rite?!? and how to find length of AG?

2. Originally Posted by xiaoz
my ans for (a)i ---> 236cm cube.
the given ans is ---> 240 cm cube ?
hu is rite?!? and how to find length of AG?
Hello,

you are dealing with a prism.

$V_{prism}=l\times w\times h$

The base area is 8 cm long and 5 cm wide, that means the area is 40 cm^2. The height of the prism is 6 cm. So

$V_{prism}=8 cm \times 5 cm \times 6 cm=240 cm^3$

The length of the diagonal through the space of the prism is calculated by:

$d=\sqrt{l^2+w^2+h^2}$. Plug in the values you know:

$d=\sqrt{(8 cm)^2+(5 cm)^2+(6 cm)^2}=\sqrt{125 cm^2}=5\cdot \sqrt{5} cm$ $\approx 11.18 cm$

Greetings

EB

3. wat about (b) show tt it shows..... (i)(a) n (b) .. how to show ?

4. Originally Posted by xiaoz
wat about (b) show tt it shows..... (i)(a) n (b) .. how to show ?
You can use the property that the length of tangents to a circle from an external point are equal.

Keep Smiling

Malay

5. =.= how to get tangent length

6. Originally Posted by xiaoz
=.= how to get tangent length
Hi, xiaoz,

the problem b) was done here: http://www.mathhelpforum.com/math-he...ber.php?u=1091

Bye

EB

7. Originally Posted by earboth
Hi, xiaoz,
the problem b) was done here: http://www.mathhelpforum.com/math-he...ber.php?u=1091
Bye
EB
Hi,
I noticed that the link I gave you doesn't work. No Idea why this happens now.