Answer:
Yes
Step-by-step explanation:
By the Triangle Inequality Theorem, if a supposed triangle has sides [tex]a[/tex], [tex]b[/tex], and [tex]c[/tex] where [tex]c[/tex] is the longest side, then [tex]a+b\geq c[/tex].
Here, [tex]7+12\geq18[/tex], so the given sides of the triangle can have these lengths
