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www.amazon.com/set-square-ruler/s?k=set+square+ruler

Leinuosen 6 Pieces Aluminum Triangular Architect Scale Ruler Set, 2 Pack 12 Inch Aluminum Scale Ruler with 4 Pieces Aluminum Triangle Ruler Square Set for Architects, Students, Draftsman and Engineers

en.wikipedia.org/wiki/Set_square

The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. More commonly the set square bears the markings of a ruler and a half circle protractor. The outer edges are typically bevelled.

www.ebay.com/sch/i.html?_nkw=set+square+ruler

New Set Use Square Ruler Steel Machinist Angle Combination Measuring Testers. Brand New · Unbranded. $11.87. From China. Was: Previous Price $12.49. Buy It Now +$2.68 shipping. SPONSORED. JAPAN SHINWA TRI FRAMING SET SQUARE RIGHT ANGLE STRAIGHT EDGE L RULER 30CM*20CM. Brand New · Shinwa. $16.14. From China.

www.walmart.com/ip/Omnigrid-Ruler-Set-Squares/17337841

Whether drafting or building, you can proceed with confidence when using these rulers. The set comes with full instructions for use. Omnigrid Ruler Set, Squares: Designed for ultimate accuracy; Clear acrylic construction; Black and yellow markings; Instructions for use included; Square ruler set contains 3 rulers: 1" x 6", 4" x 4" and 6" x 6"

www.kimberbelldesigns.com/product/orange-pop-rulers-square-set

KDTL101, Orange Pop Rulers, Square Set Includes: 4.5″, 6.5″, and 8.5″. Blocks will finish at 4, 6, and 8”. Square set has a bonus half square triangle ruler in two sizes! Enjoy a free downloadable pattern to use with your Orange Pop Rulers by clicking HERE. Patent pending.

en.wikipedia.org/wiki/Steel_square

The steel square is a tool used in carpentry. Carpenters use various tools to lay out structures that are square (that is, built at accurately measured right angles), many of which are made of steel, but the name steel square refers to a specific long-armed square that has additional uses for measurement, especially of various angles.

www.homedepot.com/b/Tools-Hand-Tools-Measure-Layout-Tools...

The Empire 36 in. Aluminum Straight-Edge Ruler is The Empire 36 in. Aluminum Straight-Edge Ruler is great for measuring surfaces up to 3 ft. It is made with heavy-duty aluminum for durability. Features easy-reading inch-scale graduations for greater precision.

www.grainger.com/.../precision-steel-squares

Come to Grainger to stock up on precision steel squares. You’ll find squares with hardened and precision ground edges, lapped beams and blades, machined inner corners for clearance of burrs or dirt and 2-piece and 4-piece square sets with various sized squares.

www.staedtler.com/.../rulers-set-squares

Rulers: Practical aids for drawing and measuring. First and foremost, rulers are a practical tool for drawing straight lines. To do this, place the ruler at specific points on a drawing or surface. Then trace the edge of the ruler with a pencil or technical pen to draw a straight line on the paper. A ruler can also be used to quickly measure ...

mathsteacher.com.au/year8/ch10_geomcons/07_setsquare/set.htm

A 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.