11. Given 7 points on a circle, connect them pairwise with chords. In this figure, there are at least
$\qquad$ triangles, and at most $\qquad$ triangles.
11. 284,287

When any three chords do not intersect at one point inside the shape, the number of triangles in the figure is maximized. Among them, the number of triangles with 3 vertices on the circumference is $C_{7}^{3}$, the number of triangles with 2 vertices on the circumference is $4 C_{7}^{4}$, the number of triangles with 1 vertex on the circumference is $5 C_{7}^{5}$, and the number of triangles with all 3 vertices inside the circle is $C$, totaling 287. Considering the case where 3 chords intersect at one point, there can be at most 3 such intersections, hence the number of triangles is at least 284.