Question

Show how it is possible for two triangles to intersect one point, two points, three points, four points, five points, or six points, but not seven points. Show how they can intersect in infinitely many points.

Answer 1

6 points

Answer 2

there are only 3 sides in a triangle, so 2 triangles can intersect only up to 6 times. two overlapping triangles intersect at infinitely many points