Colouring a circle and its segments

[Francis Nugent Dixon]

Hi from Beautiful Brittany,

Strange, can't find these answers on the Internet, 
and I have tried all the colour instructions to no avail.

1 - How do you colour a circle (graphic) ?
2 - How do you colour a segment of this circle ?

Answers welcome ……

-Francis

"Nothing should ever be done for the first time !"