Question

By how much degrees should the curves y^2+x^2=a^2 and y= sq root (a^2-x^2) be rotated around x axis respectively to get a sphere ?
A- 0° , 0°
B- 90° ,0°
C- 90°, 90°
D- 360° , 360°
E- 180° , 360 °
F- 90 °, 180°
G- Not possible

Answer 1

think about E