Architectural Drawing

The Set Square

Rajil TL
Rajil TL
3 Min Read
Disclosure: This website may contain affiliate links, which means I may earn a commission if you click on the link and make a purchase. I only recommend products or services that I personally use and believe will add value to my readers. Your support is appreciated!
There are two types of set squares and they are named according to the angles present on each.Set squares are useful for drawing parallel lines and perpendicular lines.
Parallel LinesLines that lie in the same plane and do not meet one another are said to be parallel lines.In the accompanying diagram, the line AB is parallel to the line CD.  This is indicated by the similar arrows.
Drawing Parallel LinesA ruler and set square can be used to draw parallel lines as described below.Step 1:  Position an edge of the set square against a ruler and draw a line along one of the other edges.
Step 2:  Slide the set square into a new position while keeping the ruler fixed exactly at the same position.
Step 3:  Draw a line along the same edge that was used in Step 1.

Example 17Use a ruler and set square to draw a line that is parallel to a given line, AB, and passes through a given point, P.Solution:Step 1:  Position an edge of the set square along the given line, AB.
Step 2:  Place a ruler against one of the other edges.
Step 3:  Slide the set square along the ruler until the edge used in Step 1 passes through the given point P.
Step 4:  Draw the line CD through P.The line CD passes through the given point, P, and is parallel to the given line AB.
Perpendicular LinesLines that are at right angles to each other are said to be perpendicular lines.Note that a vertical line is perpendicular to the horizontal, whereas perpendicular lines can be drawn in any position.  Bricklayers use a plumb-bob to set out vertical lines and a spirit level to set out horizontal lines.
Drawing Perpendicular LinesA set square can be used to draw a perpendicular at a point on a given line as described below.Step 1:  Set an edge of the set square on the given line so that the other edge is just in contact with the point.
Step 2:  Draw a line that passes through the given point with the help of the set square.
Example 18Use a set square to draw a perpendicular to a given line, AB, through a point, P, not on the line.Solution:Step 1:  Set an edge of the set square on the given line so that the other edge is just in contact with the point.
Step 2:  Draw a line that passes through the given point with the help of the set square.
Types of Drawings used in Building Construction
Printable Cover Page Templates
Axonometric projections
Report Cover Page Designs
Types of Measured Survey Drawings
Share This Article
ByRajil TL

Rajil TL is a SenseCentral contributor focused on tech, apps, tools, and product-building insights. He writes practical content for creators, founders, and learners—covering workflows, software strategies, and real-world implementation tips. His style is direct, structured, and action-oriented, often turning complex ideas into step-by-step guidance. He’s passionate about building useful digital products and sharing what works.

Previous Article Comparative Advantage and the Benefits of Trade
Next Article Exchange and Trade
Leave a review

Stay Connected

- Advertisement -

Latest News

How to Create Launch Tutorials for New Products guide by SenseCentral
How to Create Launch Tutorials for New Products
Digital Product Marketing
How to Create Pre-Launch Content for Digital Downloads guide by SenseCentral
How to Create Pre-Launch Content for Digital Downloads
Digital Product Marketing
How to Announce a New Template Bundle guide by SenseCentral
How to Announce a New Template Bundle
Digital Product Marketing
How to Announce a New Digital Product on Your Blog guide by SenseCentral
How to Announce a New Digital Product on Your Blog
Digital Product Marketing

You Might also Like