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**Geometric Terms and Construction**

4 Geometric Terms and Construction

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**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 versus circumscribed

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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?**

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

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

Helix

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