Hello!
You can use the Pythagorean Theorem
18.8 / 2 = 9.4
[tex] 4.7^{2} + 9.4^{2} = c^{2} [/tex]
square the numbers
[tex]22.09 + 88.36 = c^{2} [/tex]
Add
[tex]110.45 = c^{2} [/tex]
Take the square root of both sides
10.5 = c
The answer is A) 10.5
Hope this helps!
