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What is the measure of ∠R to the nearest degree?

31°

53°

58°

80°

oscar.a1551  May 15, 2018
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 #1
avatar+86643 
+3

Using the Law of Sines

 

sin 69 / 35  = sin R / 30    multiply  both sides by 30

 

(30/35)sin69  = sin R

 

(6/7) sin 69   = sin R

 

Use the sine inverse to find R

 

arcsin [  (6/7) sin 69 ]  =  R  = 53°

 

 

cool cool cool

CPhill  May 15, 2018

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