We study the problem of finding maximum-area triangles that can be inscribed in a polygon in the plane. We consider eight versions of the problem: we use either convex polygons or simple polygons as the container; we require the triangles to have either one corner with a fixed angle or all three corners with fixed angles; we either allow reorienting the triangle or require its orientation to be fixed. We present exact algorithms for all versions of the problem. In the case with reorientations for convex polygons with n vertices, we also present (1 − ε)-approximation algorithms.
Given a convex polygon P with k vertices and a polygonal domain Q consisting of polygonal obstacles with total size n in the plane, we study the optimization problem of finding a largest similar copy of P that can be placed in Q without intersecting the obstacles. We improve the time complexity for solving the problem to O(k 2 n 2 λ 4 (k) log n). This is progress of improving the previously best known results by Chew and Kedem [SoCG89, CGTA93] and Sharir and Toledo [SoCG91, CGTA94] on the problem in more than 25 years.
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