The base of a triangle is 80, and one side of the base angle is 60∘. The sum of the lengths of the other two sides is 90. The shortest side is:
<spanclass=′latex−bold′>(A)</span>45<spanclass=′latex−bold′>(B)</span>40<spanclass=′latex−bold′>(C)</span>36<spanclass=′latex−bold′>(D)</span>17<spanclass=′latex−bold′>(E)</span>12