I want to create Circles of particular radius for latitude and longitude points plotted on map

I am interested to create circle of different radius taking latitude and longitude as center, but I am not getting the circles on map. The code that am using is as given below:

lat = [21.1658, 21.1655, 21.16672,  21.16441, 21.15638,  21.17103, 21.17166, 21.14175, 21.17098, 21.17521,21.16423, 21.17525, 21.16205]; 

lon = [72.7939, 72.7937, 72.79333,  72.77744, 72.77798,  72.78658, 72.78956, 72.75316, 72.77758 ,72.80426, 72.79398, 72.78943, 72.75631];

plot(lon, lat, '.b', 'MarkerSize', 15);

grid on
plot_google_map('MapScale', 1)
R = 1 ;    % radius of circle 

C = [21.1658 72.7939];   % center of circle 

th = linspace(0,2*pi) ;

x  = C(1)+R*cos(th) ; 

y = C(2)+R*sin(th) ;

plot(x,y);

Answer 1

[Manju A B]

Error in circlevirtual (line 5)

plot_google_map('MapScale', 1)