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In right triangle $DEF$, we have $\angle D = 25^\circ$, $\angle E = 90^\circ$, and $EF = 9$. Find $DE$ to the nearest tenth. You may use a calculator for this problem.

 Jun 22, 2021
 #1
avatar+121000 
+2

F

 

9

 

E               25   D

 

tan  D   =  EF  / DE

 

tan  25°  =  9 / DE

 

DE  =  9   /  tan  25°    ≈  19.3

 

 

 

 

cool cool cool

 Jun 22, 2021

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