1. Draw a line segment AB = 5.8 cm.
2. At point A, draw an angle 60° i.e. \(\angle \) A = 60°.
3. At point B, draw an angle of 30° i.e. \(\angle \)B= 30°.
4. Now the two rays intersect at the point C.
Then, \(\triangle \) ABC is the required triangle.