# Geometric Terms and Construction

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Geometric Terms and Construction
4 Geometric Terms and Construction

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

Two-Dimensional Shape Terminology

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

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

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

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

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

Orientation Terminology
Parallel Perpendicular

Orientation Terminology
Concentric Eccentric Coaxial

Orientation Terminology
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?

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

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

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