Trying to colour a circle but not all only one qudrant want to colour

How can i colour a quadrant of circle by yellow and rest by any colour

Answer 1

[KALYAN ACHARJYA]

viscircles([0,0],1);
hold on;
alpha=linspace(0,90)/180*pi;
% Manage Angles ^^ here Quadrant angles
patch([0 cos(alpha) 0], [0 sin(alpha) 0], 'b');
axis off;

Disclaimer: 2nd part of the code from Thorsten this answer

Result