## sohailiftikhar one year ago 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

1. IrishBoy123

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....

2. sohailiftikhar

can you draw daigrame to elaborate this please ..?

3. IrishBoy123

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?

4. sohailiftikhar

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

5. IrishBoy123

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

6. sohailiftikhar

I think semi circule...