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Need help on this question please

 

 Sep 19, 2020
 #1
avatar+31093 
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As follows:

 

 Sep 19, 2020
 #2
avatar+240 
+1

Let an angle BAD be  β       β = 7º

 

1/       AD = cosβ * 3.7

 

2/      BD = sinβ * 3.7

 

3/      A(ΔABD) = (AD * BD) / 2

 

4/      A(ΔADC) = A(ΔABD) + 22.4

 

5/     CD = (2 * A(ΔADC)) / AD

 

6/     b = sqrt( AD2 + CD2 )   

 

 Sep 19, 2020

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