Fuzzy plane geometry: triangles

Bogomolny, 1987, On the perimeter and area of fuzzy sets, Fuzzy Sets and Systems, 23, 257, 10.1016/0165-0114(87)90062-5 Rosenfeld, 1984, The diameter of a fuzzy set, Fuzzy Sets and Systems, 13, 241, 10.1016/0165-0114(84)90059-9 Rosenfeld, 1990, Fuzzy rectangles, Pattern Recognition Lett., 11, 677, 10.1016/0167-8655(90)90101-7 Rosenfeld, 1985, The perimeter of a fuzzy set, Pattern Recognition, 18, 125, 10.1016/0031-3203(85)90035-4 Zadeh, 1965, Fuzzy sets, Information and Control, 8, 338, 10.1016/S0019-9958(65)90241-X