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### Drafting Tools & Geometry for Drafting

Word or PhraseDefinition
Protractor Tool used to measure and draw angles.
Compass Used to accurately draw circles manually.
T-Square Tool used to create horizontal lines manually.
Dividers Used to transfer distances accurately.
Scale Contains calibrations in some exact proportion to full size, used to measure or layoff distances.
Triangle Used in combination with a T-square to draw lines at various angles or to produce right angles.
Template Used to quickly draw circles, ellipses, polygons, etc.
Shield Used to erase only portions of a drawing while protecting other lines.
French Curve An instrument used to draw irregular shaped curves.
Vellum Durable transparent paper used for permanent drawings.
OSNAPS Purpose in AutoCAD is to increase accuracy and precision.
Geometry The study of the size and shape of things.
Obtuse Angle More than 90, less than 180 degrees.
Acute Angle Less than 90 degrees.
Supplementary Angles Two Angles that add up to 180 degrees.
Complimentary Angles Two Angles that add up to 90 degrees.
Parallel Lines Two or more lines that are equal distance apart.
Radius The distance of a straight line measured from the center of an arc or circle to any point on the circumference.
Diameter Distance of a straight line that passes through the center of the circle touching opposite points on the circumfernece.
Rectangle Opposite sides are equal, internal angles are 90 degrees.
Square All four sides are equal, internal angles are 90 degrees.
Regular Polygon Three or more equal straight sides with internal angles that are equal. (Example: Hexagon, Octagon)
Concentric Two or more circles that share the same center.
Eccentric Two or more circles that do not share the same center.
Customary units Unit of measurement used in the United States. (English or Standard units)
Drawing to Scale Process of reducing or enlarging an object.
Hypotenuse The longest side of right angle.
Geometric Construction A drawing made up of points and lines drawn in proper relationship to one another to solve design problems.
Equilateral Triangle Name given to a triangle with equal sides and equal angles.
Isoceles Triangle Triangle with two sides of equal length.
Circumference The distance around a circle.
Perpendicular Lines drawn at 90 degrees or Right Angles.
Inscribed Inside the imaginary circle.
Circumscribed Outside the imaginary circle.
Tangent A line or arc that connects to another line or arc at only one point without any crossing or intersection, and flows away from that point.
Pythagorean Theorem Used to calculate the hypotenuse of a right triangle.
Created by: tmurphy

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