Answer:
A. Acute
Step-by-step explanation:
To start, determine whether you can form a triangle or not. In any triangle, the sum of any two sides must be greater than the third side. In this case, this holds true and we can definitely form a triangle.
Let [tex]c[/tex] be the longest side of the triangle and let [tex]a[/tex] and [tex]b[/tex] be the other two sides.
If [tex]a^2+b^2>c^2[/tex], the triangle is acute.
If [tex]a^2+b^2=c^2[/tex], the triangle is right.
If [tex]a^2+b^2<c^2[/tex], the triangle is obtuse.
Substituting given information:
[tex]7^2+9^2>11^2[/tex], therefore the triangle is acute.
