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In right triangle DEF, we have D = 25, E = 90, and EF = 93. Find DE to the nearest tenth. You may use a calculator for this problem.

 Jul 26, 2021
 #1
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Here is one way....use law of sines

93 is to sin 25    as   DE is to sin 65

 

93 / sin25   =   DE/sin 65

 

sin 65o  *  93  / sin 25o   = DE        Use your calculator to finish !   cheeky

 Jul 26, 2021
 #2
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+1

DE = 93 / tan(25º) = 199.4

 Jul 26, 2021

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