MHB Prove Geometry Challenge: Cyclic Quadrilateral PQRS

AI Thread Summary
In the discussion about the cyclic quadrilateral PQRS with given side lengths and angles, participants are tasked with proving the equation |√(r+p) - √(r+q)| = √(r-p-q). The angles provided are ∠PQR = 120° and ∠PQS = 30°. A solution was shared by a user named Albert, prompting others to engage with the problem. The thread encourages further attempts at solving the challenge. The focus remains on the geometric properties and relationships within the cyclic quadrilateral.
anemone
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Given a cyclic quadrilateral $PQRS$ where $PQ=p,\,QR=q,\,RS=r$, $\angle PQR=120^{\circ}$ and $\angle PQS=30^{\circ}$.

Prove that $|\sqrt{r+p}-\sqrt{r+q}|=\sqrt{r-p-q}$
 
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anemone said:
Given a cyclic quadrilateral $PQRS$ where $PQ=p,\,QR=q,\,RS=r$, $\angle PQR=120^{\circ}$ and $\angle PQS=30^{\circ}$.

Prove that $|\sqrt{r+p}-\sqrt{r+q}|=\sqrt{r-p-q}$

my solution :

View attachment 4127
 

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Thank you Albert for your solution:cool: and I will post the answer that I have at hand later, in case there are others who might want to try it..
 
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