your circle is in a rectangle with upper left corner at myArray(i).x,myArray(i).y and is 15 wide and 15 high

therefore the CENTER of your circle is myArray(i).x+7.5,myArray(i).y+7.5
measure the distance from THAT point to mouse X,Y and if less or equal to 7.5 then mouse is INSIDE your circle

so? the math is the same… I’m ASSUMING you understand basic Geometry…
find the center of the circle and detemine if the distance from that point to the mouse is less or equal to the radius of the circle