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In the following Δ\(PQR\), \(PQ = PR\) and \(S\) is the mid-point of \(QR\).
 
Ex_9.1.png
 
1. The pairs of equal parts in Δ\(PSQ\) and Δ\(PSR\).
 
a. \(PS =\) .
 
b. \(∠SPQ = ∠\).
 
2. Is QSPRSP
.
Answer variants:
NO
Yes