Triangle	a	b	c	s	s - a	s - b	s - c	Area
1	5	5	5	7.5	2.5	2.5	2.5	10.825	Delete
2	12	13	15	20	8	7	5	74.833	Delete
3	3	3	3	4.5	1.5	1.5	1.5	3.897	Delete
4	3.1	3	4.212	5.156	2.056	2.156	0.944	4.645	Delete
5	3.1	3	4.212	5.156	2.056	2.156	0.944	4.645	Delete