Question

Calculate the length of QR.
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Answer 1

Answer:

You can get two equations:

A=pr2sin(40∘)

and

152=p2+r2−2prcos(40∘)=p2+r2−4Acot(40∘)

(Note that

pr=2Asin(40∘)

). With these equations you can compute p=RQ or r=PQ.

That's my answer idk if u can read it properly but trust me thats my answer :D