Consider this option (basic steps are marked).
Answer:
where is the question
Step-by-step explanation:
Focus on triangles DFC and DFE:
- They are both right triangles because DF is perpendicular to EC
- DC=DE
- DF is a common side
So, the two triangles are congruent. It follows that CF=FE, and in particular

And since x=3, the length of EF is

Answer:
look the photo
Step-by-step explanation:
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