Lesson 2.1

47 terms

acute triangle

a triangle whose interior angles are all acute

angle

the space between two lines or planes that intersect

area

the extent of a 2-dimensional surface enclosed within a boundary

axis

the center around which something rotates

cartesian coordinate system

a coordinate system for which the coordinates of a point are its distances from a set perpendicular lines that intersect at the origin of the system

chamfer

two surfaces meeting at an angle different from 90 degrees

circle

ellipse in which the two axes are of equal length

circumscribe

to draw a geometric figure around another figure so that the two are in contact but do not intersect

computer-aided design

software that allows you to create engineering, architectural, and scientific designs

countersink

a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface

counterbore

a cylindrical recess around a hole, usually to receive a bolt head or nut.

cylinder

a solid figure with two congruent and parallel circular bases

diameter

the length of a straight line passing through the center of a circle and connecting two points on the circumference

ellipse

a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it

extrusion

something that bulges out or is protuberant or projects from a form

geometric constraint

constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity.

inscribe

write, engrave, or print as a lasting record

mass

(often followed by 'of') a large number or amount or extent

numeric constraint

a number value, or algebraic equation that is used to control the size or location of a geometric figure

obtuse triangle

a triangle that contains an obtuse interior angle

origin

the point of intersection of coordinate axes

parallelogram

a quadrilateral whose opposite sides are both parallel and equal in length

pattern

a customary way of operation or behavior

pi

the ratio of the circumference to the diameter of a circle

plane

(mathematics) an unbounded two-dimensional shape

polygon

closed plane figure having, literally, many angles and therefore many sides

prism

optical device having a triangular shape and made of glass or quartz

a four-sided polygon

the length of a line segment between the center and circumference of a circle or sphere

rectangle

a parallelogram with four right angles

regular polygon

a polygon with all sides and all angles equal

revolution

the movement of an object around another object

right triangle

a triangle with one right angle

rotation

a single complete turn (axial or orbital)

round

having a circular shape

solid

a three-dimensional shape

solid modeling

a type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces. This allows for analysis of the object's mass properties

space

the unlimited expanse in which everything is located

square

a plane rectangle with four equal sides and four right angles

surface area

the total area of the 2-dimensional surfaces that make up a 3-dimensional object

tap

a light touch or stroke

taper

the property possessed by a shape that narrows toward a point (as a wedge or cone)

three-dimensional

having the dimensions of height, width, and depth

triangle

a three-sided polygon

two-dimensional

having the dimensions of height and width, height and depth, or width and depth only

vertex

the point of intersection of lines or the point opposite the base of a figure

volume

the amount of 3-dimensional space occupied by an object