Direction of a satellite in a circular orbit

[ND3G]

A satellite is designed to orbit Earth at an altitude above its surface that will place it in a gravitational field with a strength of 4.5 N/kg

a) Calculate the distance above the surface of Earth at which the satellite must orbit

b) Assuming the orbit is circular calculate the acceleration of the satellite and its direction

I have solved part a) using the equation: Fg = sqr of Gm/r^2

I also solved the accelaration of the satellite by first finding the velocity (v = sqr of Gm/r) and then the circular acceleration (Ac = V^2/r).

I am a bit confused as to what they are asking for with regards to direction. I could work out the curve I suppose though I do not recall what forumula I would use. Can someone point me in the right direction please?

Thanks

 

[Hootenanny]

The question is asking for the direction of the acceleration vector...

 

[ND3G]

Do you think that it is enought to state that the acceleration is towards the centre of the Earth so do I need to prove it mathematically?