The shape obtained by rotating y=sq root (a^2 - x^2) about x-axis is called
A- circle
B- semi circle
C- sphere
D- hemisphere
E- parabola
F- No definite shape

Question

The shape obtained by rotating y=sq root (a^2 - x^2) about x-axis is called
A- circle
B- semi circle 
C- sphere 
D- hemisphere 
E- parabola
F- No definite shape

irishboy123 · Answer

go down this path and see where it leads/ what you recognise:
$y=\sqrt{ a^2 - x^2} $ 
$y^2=\ a^2 - x^2 $ 
etc....

sohailiftikhar · Answer

can you draw daigrame to elaborate this please ..?

irishboy123 · Answer

i can't do it for you but we can take the equation further:
$x^2 + y^2= a^2 $

does that mean anything to you?

sohailiftikhar · Answer

yes can explain it with different method its up to you ..thank you for explaining it ..please elaborate it ..

irishboy123 · Answer

what shape does that equation give in the xy plane...?

sohailiftikhar · Answer

I think semi circule...