4 Geometric Terms and Construction Permission granted to reproduce for educational use only. Define...

4 Geometric Terms and Construction

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.


Two-Dimensional Shape Terminology

• Related to circles:– Arc and circle– Center point– Radius and diameter– Chord– Sector– Quadrant– Semicircle



• Related to angles:– Right– Acute– Obtuse– Complementary– Supplementary



• Related to triangles:– Right– Equilateral– Isosceles– Scalene



• Related to quadrilaterals:– Square– Rectangle– Rhombus and rhomboid– Trapezoid and trapezium



• Related to polygons– Pentagon– Hexagon– Heptagon– Octagon

• Inscribed versuscircumscribed


Three-Dimensional Form Terminology

• Terms– Primitives– Right versus oblique

• Basic 3D Primitives– Cube– Prism– Cylinder– Sphere– Cone


Orientation Terminology

• Parallel• Perpendicular



• Concentric• Eccentric• Coaxial



• Tangent• Point of tangency


Specialized Geometric Shapes

• Conic section terms:– Hyperbola– Parabola– Ellipse


Specialized Geometric Shapes

• Specialized terms:– Involute– Helix– Spline


• 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).


• What is the three-dimensional equivalent (or extension) of the concentric orientation?

Coaxial


• List four conical sections

Circle, ellipse, hyperbola, and parabola


• Which of the following is not a 2D shape: cone, circle, pentagon, trapezoid?

Cone


• Which of the following is a 3D form: octagon, rhomboid, torus, scalene?

Torus


• What type of geometric construction is represented by screw threads?

Helix

4 Geometric Terms and Construction Permission granted to reproduce for educational use only. Define...

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