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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.

 May 16, 2021
 #1
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Try using law of sines for this problem.

Sine(A)/a = Sine(B)/b = Sine(C)/c

https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-non-right-triangles-trigonometry/hs-geo-law-of-sines/v/law-of-sines

 

=^._.^=

 May 16, 2021
 #2
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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.

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∠D = 25º       ∠E = 90º         EF = 93 units

 

DE = (EF) / tan(∠D)

 

DE = 199.4 units

 May 17, 2021

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