Answer: approximately 11.7
Step-by-step explanation: You should us Pythagorean theroem a2+b2=c2 a is 10 so it would be 10 squared b is 6 squared so 10 squared is 100 and 6 squared is 36 so just add 100+36 equals 136=c2 so then square root that and you get approximately 11.7. Hope it helps have a good day!