Answer:
The first set (5, 6, 12) can not be a triangle.
Step-by-step explanation:
In a triangle, the two smaller sides cannot add up to less than the longest side. This would make it an impossible triangle. Since 5 + 6 is equal to 11, which is less than 12, this triangle is not real.
1a
2b
3b
4b
5d
i think this is it
80
5/8
