We are given a line segment of length 8.6 cm

We have to bisect it and measure each part.

Now we will follow the following steps of construction.

STEP1: Draw a line segment AB = 8.6 cm by using a graduated ruler.

STEP 2: With A as centre and radius more than half of AB, draw arcs, one on each side of AB.

STEP3: With B as centre and the same radius as in step II, draw arcs cutting the arcs drawn in step II at E and F respectively.

STEP 4: Draw the line segment with E and F as end-points. Suppose it meets AB at M. Then M bisects the line segment AB.

By measuring AM and MB, we find that

AM = MB = 4.3cm