Answer: 860
Step-by-step explanation:
there isn't a 860 for an answer but it's the correct answer.
Answer:
The answer is 53 or Square Root (sqrt) of 2809
a^2+b^2=c^2
28^2+45^2=c^2
784+2025=c^2
c^2=sqrt 2809
c = 53
9