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What is the measure of angle R?


(As a decimal rounded to the nearest hundreth)

 Apr 16, 2018

Here you go:


 ∠ R = α = 28.072° = 28°4'21″ = 0.49 rad


This is a trigonometry problem. We have to use inverse oprations.


We can use any of the sine, cosine, tangent, cotangent, secant, and cosecant since we know all of the 3 sides.


Let's just say we use sine. 


It is basically the ratio of the side opposite to the angle to the hypotenuse.


In this case, it is 8 : 17. 


The inverse of sine of 8/17 is 49 rad or about 28 degrees.


I hope this helps. 

 Apr 16, 2018

yup, thank you

AgentFatboy  Apr 16, 2018

A small typo in radians. It should read 0.49 radians.

 Apr 17, 2018

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