9514 1404 393
Answer:
e ≈ 11.0
Step-by-step explanation:
The law of cosines tells you ...
e² = d² +f² -2df·cos(E)
e² = 196 +81 -252cos(52°) ≈ 121.853
e ≈ √121.853 ≈ 11.04
