What is the use of a speed square?
A Speed Square (rafter square, rafter angle square, triangle square) is a triangular-shaped, carpenters' marking out tool manufactured and sold by Swanson Tool Co., Inc. The Speed Square combines some of the most common functions of the combination square, try square, and framing square into one.
A T-square is a technical drawing instrument used by draftsmen primarily as a guide for drawing horizontal lines on a drafting table. It may also guide a set square to draw vertical or diagonal lines. T-squares are also used to measure and cut drywall.
- A combination square is a tool used for multiple purposes in woodworking, stonemasonry and metalworking. It is composed of a ruler and one or more interchangeable heads that may be affixed to it. The most common head is the standard or square head which is used to lay out or check right and 45° angles.
- Examples where the unit is used are roofing shingles, metal roofing, vinyl siding, and fibercement siding products. Some home builders use squares as a unit in floor plans to customers. Buildings in Australia no longer use the square as a unit of measure, and has been replaced by square metres.
- A protractor is a handy tool used to measure and draw angles. Generally, semi-circular in shape, protractors are also available in full-circle, 360-degree versions.
A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline.
- Construct: a line through P perpendicular to given line.
- Place your compass point on P and swing an arc of any size that crosses the line twice.
- Place the compass point on one of the two locations where the arc crossed the line and make a small arc below the line (on the side where P is not located).
- Construct: a square inscribed in a circle.
- Using your compass, draw a circle and label the center O.
- Using your straightedge, draw a diameter of the circle, labeling the endpoints A and B.
- Construct the perpendicular bisector of the diameter, .
- Label the points where the bisector intersects the circle as C and D.
- For example:
- You can draw a regular polygon using a circle.
- You can draw a square.
- You can draw a regular pentagon, with five equal sides/angles.
- You can draw a regular hexagon, with six equal sides/angles.
- You can draw a regular octagon, with eight equal sides/angles.
Drywall T-Square. A T-square is a tool used in technical drawing, primarily as a guide for drawing straight horizontal lines on a drafting table. It can also be used in conjunction with a set square to draw vertical and angled lines. Its name is derived from its resemblance to the letter 'T'.
- The star below has 5 lines of symmetry, five lines on which it can be folded so that both sides match perfectly. A common misconception found even in many glossaries and texts: Not all lines that divide a figure into two congruent parts are lines of symmetry.
- The letter Z is an example of "2-fold Rotational Symmetry"; it looks the same after being rotated by 180° around its center. But it does not have mirror symmetry. Shapes like this are called "chiral", which means that they can not be superimposed on their mirror images.
- Many distinct curves are commonly called ovals or are said to have an "oval shape". Generally, to be called an oval, a plane curve should resemble the outline of an egg or an ellipse. an oval would generally have an axis of symmetry, but this is not required.
Updated: 8th October 2018