detecting the points inside circle

In the image below,i have drawn a circle over a surf points,please tell how to find that surf point inside the circle

http://imgur.com/RsRHy2V

the code i used is

[p,f]=uigetfile();

I=imread(strcat(f,p));

% imshow(I)

 I1=rgb2gray(I);
points = detectSURFFeatures(I1);
imshow(I); hold on;
plot(points.selectStrongest(100))
[x1 y1 r]=circle_saptha4(plot(points.selectStrongest(100)));

where circle_saptha4 is a function program,for drawing a circle

please tell is it possible to find the point inside that circle

I'm not sure what you mean by "find the point". You already know everything about the point including its location because you drew a circle around it. What more do you want to know?