A cheetah travels 20 km west in an hour. The cheetah stops for another hour. Then, the cheetah travels another 40 km west in two
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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