4. in figures 6.41, ∆ PQR and ∆ SQR are both isosceles with common base QR. the equal side have been shown with similar markings.if angle P= 60° and angle S = 40°, find(1) angle PQR and angle PRQ(2) angle SQR and angle SRQ(3) angle PQS and angle PRS. Are these equal?

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