Answer:
20.8
Step-by-step explanation:
Use the Pythagoras's Theorem
12²-36²=[tex]\frac{x}{2}[/tex]²
144-36=[tex]\frac{x}{2}[/tex]²
108=[tex]\frac{x}{2}[/tex]²
Root both sides
√108=√[tex]\frac{x}{2}[/tex]²
[tex]\frac{x}{2}[/tex]≈10.4
[tex]\frac{x}{2}[/tex]·2=10.4·2
x=20.8
