51/3+-39/18
= 89/6
Answer is 14.833333
You can solve by using Pythagoras theorem.
Let the longest side be c.
a^2 + b^2 = c^2
If this holds, it is a right angle.
But, 3.5^2 + 4.5^2 is not equal to 5.5^2.
The shortest distance between 2 concentric circles is the difference of their radii. Thus the answer is 8-2=6
