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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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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology Related to circles: –Arc and circle –Center point –Radius and diameter –Chord –Sector –Quadrant –Semicircle

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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology

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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology Related to angles: –Right –Acute –Obtuse –Complementary –Supplementary

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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology Related to triangles: –Right –Equilateral –Isosceles –Scalene

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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology Related to quadrilaterals: –Square –Rectangle –Rhombus and rhomboid –Trapezoid and trapezium

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Permission granted to reproduce for educational use only. Two-Dimensional Shape Terminology Related to polygons –Pentagon –Hexagon –Heptagon –Octagon Inscribed versus circumscribed

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Permission granted to reproduce for educational use only. Three-Dimensional Form Terminology Terms –Primitives –Right versus oblique Basic 3D Primitives –Cube –Prism –Cylinder –Sphere –Cone

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Permission granted to reproduce for educational use only. Orientation Terminology Parallel Perpendicular

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Permission granted to reproduce for educational use only. Orientation Terminology Concentric Eccentric Coaxial

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Permission granted to reproduce for educational use only. Orientation Terminology Tangent Point of tangency

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Permission granted to reproduce for educational use only. Specialized Geometric Shapes Conic section terms: –Hyperbola –Parabola –Ellipse

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Permission granted to reproduce for educational use only. Specialized Geometric Shapes Specialized terms: –Involute –Helix –Spline

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Permission granted to reproduce for educational use only.

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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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Permission granted to reproduce for educational use only. What is the three-dimensional equivalent (or extension) of the concentric orientation? Coaxial

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Permission granted to reproduce for educational use only. List four conical sections Circle, ellipse, hyperbola, and parabola

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Permission granted to reproduce for educational use only. Which of the following is not a 2D shape: cone, circle, pentagon, trapezoid? Cone

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Permission granted to reproduce for educational use only. Which of the following is a 3D form: octagon, rhomboid, torus, scalene? Torus

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Permission granted to reproduce for educational use only. What type of geometric construction is represented by screw threads? Helix

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