Construct a quadrilateral PQRS with PQ=4.7 cm,QR=3.9 cm,∠QPS=75o,∠PQR=120o and ∠QRS=105o. Measure ∠PSR.
⇒ Draw a line segment PQ=4.7cm
⇒ Take P and Q as a center and draw an angle of 75o and 120o.
⇒ Cut off QR=3.9cm
⇒ Take R as a center and draw an angle of 105o, which meet angle P at point S.
⇒ Now, measure ∠PSR
⇒ We get, ∠PSR=60o.