Glossary
- Acute Angle/Triangle
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an angle/triangle with an angle smaller than 90°
- Allowance
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the material needed for a specific component-“We must allow this much extra”. Usually a seam for connection
- Apex
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the intersection point of a cone, as seen in the elevation view
- Arc
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a portion of a circumference
- Auxiliary Line
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an extra element line added, different from the standard divisions
- Bisect
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to divide in half
- Chord
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a straight line from 2 points on a circumference
- Circumference
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the distance around a circle, perimeter of a circle
- Diameter
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the distance across a circle at center, twice the radius
- Elbow Rule
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the number of pieces of a round elbow times 2 then minus 2(# of pcs x 2-2) gives us the number of gores in the elbow
- Element Line
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a line representing an edge or bend
- Elevation View
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looking at the front or side of something, to have elevation (height), 2D
- Frustum
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a cone with the top cut parallel to the base
- Gore
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a part of a round elbow which allows us to calculate the miter angle
- Horizontal
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a line/plane level with the horizon. Flat, level
- Miter
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an intersection of 2 pieces- an irregular cut on the end of something
- Obtuse Angle/Triangle
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an angle/triangle with an angle larger than 90°
- Parallel
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a line/plane that is equal distance from another
- Pattern
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the shape of the object, still in 2D form
- Perpendicular
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a line/plane which is 90° to another
- Plan view
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looking down at something, a “birds eye view”, “floor plan” (2D)
- Point of Tangency
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a straight line that touches the circle at only one point
- Profile
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a half of a plan view, drawn on the outside of an object
- Quadrant
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a sector which equals one quarter of the area of a circle
- Radius
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the distance from center to any point of the circumference, half the diameter
- Right Angle/Triangle
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an angle/triangle which has a 90° angle
- Sector
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the area of a circle bound by 2 radii and an arc
- Segment
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the area of a circle bound by an arc and a chord
- Slant Height (small or large)
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the hypotenuse of a cone, outside edge. The slant height is always a true length in the elevation view
- Stretch-out
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a shape which has been “stretched out”, to take a perimeter and make it straight
- Stretch-Out Angle/Arc
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the angle or arc which encompasses a radial line pattern
- Tangent
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a line which touches only 1 point of a circumference
- Triangulation from Plan View
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the length of an element line, set 90° to the vertical height, gives the true length of that line
- True Length
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a dimension or line that is not distorted by the view
- True Length Diagram (TLD)
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a 90° corner in that we use to find the actual length of a line
- Vertex
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the point at which an angle is formed
- Vertical
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a line/plane straight up and down, vertically level (plumb)
