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# Engineering Drawings

### Vocabulary - Engineering Drawings

TermDefinition
Diameter a straight line that passes through the center of a circle and has endpoints on the circle.
Radius a straight line segment from the center of a circle to its perimeter.
Parallel Lines lines that are the same distance apart and will never meet.
Perpendicular Lines lines that are right angles (90 degrees) to each other.
Thumbnail Sketch a preliminary idea for a design with very little detail.
Isometric Drawing a way of showing a 3D object on a 2D piece of paper where all three drawing axes are 120 degrees from each other.
Perspective Drawing a way of showing a 3D object on a piece of paper where vanishing points are used to show depth.
Orthographic Drawing a way of showing a 3D object on a piece of paper using only three views (top, front, and right).
Hidden Lines a line that represents an edge that is not visible in that view; drawn with equal sized dashes
Center Lines a line used to show the center of a circular object; drawn with a long dash and then a short dash.
Object Lines a heavy solid line used on a drawing to represent the object.
Construction Lines thin lines that serve as guides when sketching or drawing; barely visible.
Created by: Mrs. Birchmore

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