Answer:
Yes it is a triangle and is an isosceles one as well.
Step-by-step explanation:
Let's try it out by using the Triangle Equality Theorem!
a+b > c, a+c > b, and b+c > a
a = 9
b = 9
c = 17
18 > 17 YES
9 + 17 > 9 YES
9 + 17 > 9 YES
It all checks out!
Since two sides are equal in length, it is an isosceles triangle.
