Steps of Construction :
(i) Draw line XY = 4.5 cm
(ii) With X as a center and radius, 4.5 cm draw an arc at Z.
(iii) With Y as a center and radius, 4.5 cm draw an arc which cuts the previous arc at Z.
(iv) Join XZ and YZ.
ΔXYZ is the required triangle and lines of symmetries are shown in the figure.