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In right triangle ABC with angle B = 90 degrees, we have 2 sin A = 5 cos A. What is sin A?

 Jun 25, 2022
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2sin A =  5 cos A     rearrange as

 

sin A / cos A  = 5 / 2

 

r =   sqrt ( 5^2 + 2^2) =  sqrt (29)

 

sin A  =  y / r   =      5 / sqrt (29)

 

 

 

cool cool cool

 Jun 25, 2022

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