construct angle Y=60, YZ=5cm and XY+YZ=9cm

steps of construction:
1. draw a line segment YZ = 5 cm
2. at point Y , draw an angle PYZ = 60 deg
3. cut an arc of 9 cm from line PY, such that QY = 9 cm
4. join QZ.
5. draw the perpendicular bisector of line segment QZ.
6. let it interscet QY at X. join XZ.
thus XYZ is the required triangle.

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