2. Geometric Terms and Construction4
Geometric Terms and Construction

3. 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.

4. Two-Dimensional Shape Terminology
Related to circles:
Arc and circle
Center point
Radius and diameter
Chord
Sector
Quadrant
Semicircle

5. Two-Dimensional Shape Terminology

6. Two-Dimensional Shape Terminology
Related to angles:
Right
Acute
Obtuse
Complementary
Supplementary

7. Two-Dimensional Shape Terminology
Related to triangles:
Right
Equilateral
Isosceles
Scalene

8. Two-Dimensional Shape Terminology
Related to quadrilaterals:
Square
Rectangle
Rhombus and rhomboid
Trapezoid and trapezium

9. Two-Dimensional Shape Terminology
Related to polygons
Pentagon
Hexagon
Heptagon
Octagon
Inscribed versus
circumscribed

10. Three-Dimensional Form Terminology
Terms
Primitives
Right versus oblique
Basic 3D Primitives
Cube
Prism
Cylinder
Sphere
Cone

11. Orientation Terminology
Parallel
Perpendicular

12. Orientation Terminology
Concentric
Eccentric
Coaxial

13. Orientation Terminology
Tangent
Point of tangency

14. Specialized Geometric Shapes
Conic section terms:
Hyperbola
Parabola
Ellipse

15. Specialized Geometric Shapes
Specialized terms:
Involute
Helix
Spline

17. 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).

18. What is the three-dimensional equivalent (or extension) of the concentric orientation?
Coaxial

19. List four conical sections
Circle, ellipse, hyperbola, and parabola

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

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

22. What type of geometric construction is represented by screw threads?
Helix