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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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Answer:

PQR+PRQ+QPR=180

PQR=PRQ =2PQR

2PQR+60=180

2PQR=180-60

PQR=120/2

PQR=60.

PRQ=60

2) triangle;

QSR+QPS+PQS=180

40+2QPS=180

2QPS= 180- 40

2QPS =140

QPS=140/2

QPS=70

PQS= 70

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