HELP ME PLEASE WALLAHI THIS SO HARDDDDDD

Answer:
OK SO I AM NOT SURE BUT I THINK THIS IS THE ANSWER!
ok so think u have to do 6 x 5= 30 and then do 30 divided by 3 which is 10. so think your answer is 10. again, i am not completely sure but I hope this helped!! <3
(if this was correct please give brainliest!!)
Answer:
7.8
Step-by-step explanation:
Use the Pythagorean Theorem:
a² + b² = c²
Substitute sides in:
6² + 5² = c²
Solve:
6² + 5² = c²
36 + 25 = c²
61 = c²
c = √61
c = 7.8