The steps of the required construction are:
1) Draw a line segment BC=4.5cm. Using a protractor, draw ∠CBD=45°. Join and extend BD.
2) Taking B as the center and radius=5.6cm, draw an arc, intersecting extended BD at point P. Join PC.
3) Taking P as the center and radius greater than , draw arcs on each side of PC. Now, taking C as the center and same radius, draw arcs, intersecting the previous arcs at points Q and R. Join and extend QR. Extended QR intersects line segment DB at point A. Join AC.
4) ∆ABC is the required triangle.
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