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To divide a straight line segment into equal parts bisect it with the arcs of a compass and a straight edge. Showing with illustration figure
Select any one side and divide its length into 5 equal parts. Draw lines that are parallel to the adjacent side to the opposite side. This will divide the rectangle into 5 equal strips.
Divide 3 inches in 5 equal parts
Divide it into equal parts with horizontal or vertical lines.
Select any one side. Divide its length into 5 equal parts. Do the same to the opposite side. Join the corresponding divisions. You will then have 5 equal rectangular divisions of the square.
When you divide something into two equal parts you are halving it. This process is often used to teach fractions in school.
Select any point inside the hexagon and draw a line segment to any point on the boundary of the hexagon. Draw 7 more such segments. These will divide the hexagon into 8 parts. The parts will not be equal but that was not a requirement of the question.
The midpoint divides a line segment into congruent parts.
bisect is to divive into equal parts.