Design and Technology Topic
Bisecting and Dividing Lines
- Read notes
- Flashcards
- Quiz
- Confident
Study focus - 3 things
- Bisecting a line means dividing it into two equal parts
- A perpendicular bisector crosses a line at its midpoint at 90 degrees
- A line can be divided into a given number of equal parts using construction steps
Section 1Bisecting a line
To bisect a line, divide it into two equal parts. The midpoint is the exact halfway point. Easy to mix up: bisecting does not mean cutting anywhere; it means two equal parts.
Section 2Perpendicular bisector
A perpendicular bisector crosses a line at 90 degrees and passes through the midpoint. Use compass arcs from both ends of the line to find crossing points above and below the line, then join those crossings.
Section 3Dividing into equal parts
To divide a line into a given number of equal parts, draw a slanting construction line from one end, mark equal spaces on it, join the last mark to the other end of the original line, then draw parallel lines through the other marks. Here's the trick: equal marks go on the slanting helper line.
Section 4Accuracy and checking
Use the same compass setting or ruler spacing carefully. Keep guide lines light and label the parts if needed. This is useful when a design must be split evenly, such as spacing holes or panels on a small project.
Examples
A 10 cm line is bisected. How long is each part?
Bisecting makes two equal parts. 10 cm divided by 2 is 5 cm, so each part is 5 cm.
A shelf front in a school workshop drawing must be divided into 4 equal spaces. Where are the equal marks first placed in the construction method?
The equal marks are first placed on a slanting construction line drawn from one end of the shelf front.
Now let's water it
Session runs notes to flashcards to quiz back-to-back.