thank you very musch
Hello helloying -
The distance from the centre of the sphere to the base of the cone = radius of sphere = 3 cm.
So the distance of the centre of the sphere to the vertex of the cone = 9 - 3 = 6 cm. So
$\displaystyle \sin x = \frac{3}{6}$
where $\displaystyle x$ is half of angle AVB.
Can you do it now?
Grandad