Australian Idol Winner: Damien Leith Vs Jessica Mauboy. November 27, 2006. Tonight the finale of the fourth season of Australian Idol was held. For the last few months, contestants from all over Australia have been performing against one another to win Australiaâs vote in the hope that they will be crowned the winner of Australian Idol 2006.
Triangles can be classified according to the relative lengths of their sides: 1  In an equilateral triangle, all sides are the same length. 2  In an isosceles triangle, at least two sides are equal in length. 3  In a scalene triangle, all sides and internal angles are different from one another.
All triangles are formed by the intersection of three diagonals at three different points. There are five arrangements of three diagonals to consider. We classify them based on the number of distinct diagonal endpoints. We will directly count the number of triangles with 3, 4 and 5 endpoints (top three figures).