1. **Problem:** Draw a line segment AB 60 mm long and bisect it. 2. **Formula and rules:** To bisect a line segment means to divide it into two equal parts at its midpoint. 3. **Steps:** 1. Draw a straight line segment AB of length 60 mm using a ruler. 2. To find the midpoint M, measure 60 mm and mark the point at 30 mm from A. 3. Point M is the midpoint, so AM = MB = 30 mm. 4. **Explanation:** Bisecting a line segment means splitting it into two equal halves. Since AB is 60 mm, the midpoint divides it into two segments of 30 mm each. 5. **Final answer:** The line segment AB is bisected at point M, where AM = MB = 30 mm.