The answer is the top one.
Yes.
To form a triangle every side must be smaller in length than the sum of the two other sides.
For example: sides denoted by a,b,c
for a triangle to form
a<b+c
b<a+c
c<a+b
Thus in the case of the <em>Isosceles </em>triangle with side lengths 1,8,8 the rules aforementioned are fulfilled. This means that a triangle with said side lengths can exist.
I could be wrong but i believe it's six
The answer is b.6 hope that helps :)
Answer:
In the attached file
Triangle of question 18 isn't visible