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PLTW - IED Unit 5 Key Terms
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Gravity
Geometry of Design
Terms in this set (36)
Acute Triangle
A triangle that contains only angles that are less than 90 degrees.
Angle
a biased way of looking at or presenting something
Area
describes the measure of the two-dimensional space enclosed by a shape
Axis
. Primary direction in a coordinate system
Center of Gravity
.A 3D point where the total weight of the body may be considered
Centroid
A 3D point defining the geometric center of a solid
Circle
A closed curve with coplanar points at the same distance from the center point
Circumscribe
To draw a figure around another, touching it at points but not cutting it.
Cylinder
a solid bounded by a cylindrical surface and two parallel planes (the bases)
Density
The mass per unit volume of an object
Diameter
The straight distance from one outside curved surface through the center point to the opposite outside curved surface
Ellipse
A regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points is constant
Fillet
A curved surface formed at the interior intersection of two or more surfaces of an object
Inscribe
A shape drawn inside a circle
Mass
the quantity of matter in an object.
Meniscus
The curved upper surface of a liquid column that is concave when the containing walls are wetted by the liquid and convex when not.
Obtuse Triangle
A triangle with one angle that is greater than 90 degrees.
Parallelogram
a four-sided polygon with opposite sides parallel
pi
The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159
Polygon
A closed plane figure with three or more straight sides
Principal Axes
The lines of intersection created from three mutually perpendicular planes, with the three planes' point of intersection at the centroid of the part.
Prism
A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms
Quadrilateral
a four-sided polygon
Radius
The distance from the center point to the outside curved surface.
Rectangle
A four-sided polygon with four right angles
Regular Polygon
a polygon with all sides and all angles equal
Right Triangle
A triangle that has a 90 degree angle
Round
Two or more exterior surfaces rounded at the intersection
Square
A polygon with four equal sides and four right angles
Surface Area
is the sum of all the areas of the faces of a three-dimensional solid.
Tangent
A line that intersects a circle or an arc at one and only one point.
Title Block
A table located in the bottom right-hand corner of an engineering drawing that identifies, in an organized way, all of the necessary information that is not given on the drawing itself. Also referred to as a title strip.
Triangle
a three-sided polygon
Vertex
Each angular point of a polygon, polyhedron, or other figure
Volume
The amount of three-dimensional space occupied by an object or enclosed within a container.
Quadrilateral
A four-sided polygon.
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