Vector question

[frog301]

Can someone explain this question to me? Where does the sine angle factor in?
Using 'SOH' Qsin(theta)=R and Q=R/sin(theta)

Not sure how to multiply these vectors and determine the magnitude is perpendicular to Q and R, because I thought magnitude and direction was solved by the sum of the vectors and getting the following:

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[Osminog]

Lol, don't waste your time.

From AAMC: "Demonstrate a general understanding of vector addition and subtraction and the right-hand rule (knowledge of dot and cross products is not required)."

 

[frog301]

Lol, don't waste your time.

From AAMC: "Demonstrate a general understanding of vector addition and subtraction and the right-hand rule (knowledge of dot and cross products is not required)."

LOL thank you haha