# Thread: Relatively simple question but i just cant get it !

1. ## Relatively simple question but i just cant get it !

Hi guys.

Am stuck with a question which looks relatively easy.

But i just simply cant get the answer !

need help urgently as i need to submit this to my tutor by today else i am toast meat !!!

2. Originally Posted by liukawa
Hi guys.

Am stuck with a question which looks relatively easy.

But i just simply cant get the answer !

need help urgently as i need to submit this to my tutor by today else i am toast meat !!!

The capital pi confused me a bit, thought it was a stray character typo, should be lowercase pi.

Also don't make the same (reading) mistake I did and think pi*y is the volume of the sphere instead of the cylinder!

Trick is to draw the radius of the sphere and find a right triangle, and use what you know about right triangles.

3. Originally Posted by undefined
The capital pi confused me a bit, thought it was a stray character typo, should be lowercase pi.

Also don't make the same (reading) mistake I did and think pi*y is the volume of the sphere instead of the cylinder!

Trick is to draw the radius of the sphere and find a right triangle, and use what you know about right triangles.
Actually i have already worked backwards and i realise that r^2 = 25-1/4h^2.

And i tried to form a right angle triangle with r and h/2 and by working backwards using pythogras theorem, i know that the hypontenus is 25. However, I just simply dont get it why is the hypontenus of this right angle triangle 25.

4. Originally Posted by liukawa
Actually i have already worked backwards and i realise that r^2 = 25-1/4h^2.

And i tried to form a right angle triangle with r and h/2 and by working backwards using pythogras theorem, i know that the hypontenus is 25. However, I just simply dont get it why is the hypontenus of this right angle triangle 25.
The hypotenuse is 5. It's the radius of the sphere, given in the problem statement.

5. Oh ya !

Thanks dude !

u are awesome !