Steps of construction :
1. Draw a line segment BC = 7 cm.
2. At point B draw a line BA making an angle of 60°.
3. With centre C mark an arc A of length 6 cm.
4. Join CA.
5. Draw a ray BX making an acute angle with BC.
6. Locate four points B1, B2, B2 and B4, on the line segment BX at equal distance.
7. Join B4C. Draw a parallel line through B, to B4C intersecting line segment BC at C'.
8. Through C' draw a line parallel to AC intersecting extended line segment AB at A'.
Hence ΔA'BC' is the required triangle.