Answer:
It is not C got it wrong.
Step-by-step explanation:
ES is half of EF since a chord is bisected by the radius. ES = 10
Let
x-------> the length side of the original cube
we have

Divide by
both sides

The system of equations is equal to
--------> equation 
--------> equation 
using a graphing tool
see the attached figure
we know that
the solution of the system of equations is the intersection both graphs
therefore
the solution is

therefore
<u>the answer is</u>

1.23 is the correct answer
Answer:
Jānis Čakste
Step-by-step explanation: