4 geometric terms and construction permission granted to reproduce for educational use only. define...
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4 Geometric Terms and Construction
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Permission granted to reproduce for educational use only.
• Define terms related to the geometry of industrial drawings.
• Describe orientation relationships found within two-dimensional and three-dimensional geometry
• List various properties of geometric constructions.• Identify two-dimensional geometric shapes.• Identify three-dimensional geometric objects.• Identify specialized geometric elements that are
used in product design.
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Two-Dimensional Shape Terminology
• Related to circles:– Arc and circle– Center point– Radius and diameter– Chord– Sector– Quadrant– Semicircle
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Two-Dimensional Shape Terminology
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Two-Dimensional Shape Terminology
• Related to angles:– Right– Acute– Obtuse– Complementary– Supplementary
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Two-Dimensional Shape Terminology
• Related to triangles:– Right– Equilateral– Isosceles– Scalene
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Two-Dimensional Shape Terminology
• Related to quadrilaterals:– Square– Rectangle– Rhombus and rhomboid– Trapezoid and trapezium
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Two-Dimensional Shape Terminology
• Related to polygons– Pentagon– Hexagon– Heptagon– Octagon
• Inscribed versuscircumscribed
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Three-Dimensional Form Terminology
• Terms– Primitives– Right versus oblique
• Basic 3D Primitives– Cube– Prism– Cylinder– Sphere– Cone
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Orientation Terminology
• Parallel• Perpendicular
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Orientation Terminology
• Concentric• Eccentric• Coaxial
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Orientation Terminology
• Tangent• Point of tangency
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Specialized Geometric Shapes
• Conic section terms:– Hyperbola– Parabola– Ellipse
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Specialized Geometric Shapes
• Specialized terms:– Involute– Helix– Spline
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• What does it mean to say that a polygon is circumscribed about a circle?
The sides of the polygon are tangent to the circle (the circle fits within the polygon).
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• What is the three-dimensional equivalent (or extension) of the concentric orientation?
Coaxial
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• List four conical sections
Circle, ellipse, hyperbola, and parabola
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• Which of the following is not a 2D shape: cone, circle, pentagon, trapezoid?
Cone
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• Which of the following is a 3D form: octagon, rhomboid, torus, scalene?
Torus
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• What type of geometric construction is represented by screw threads?
Helix