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Career &
Technical
Basic Geometric Terms &
Construction
004.00
Explain geometric terms and apply
geometric construction techniques
Career &
Technical
Basic Geometric Terms &
Construction
004.01
Explain selected geometric terms
Geometry

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
The study of the size and shape of
things
The relationship of straight and curved
lines in drawing shapes
It is essential to recognize geometry
that exists within objects for the
purpose of creating solid models or
multiview drawings
Angles

Acute Angle
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Obtuse Angle

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
Measures more than 90°
Right Angle

Vertex
Measures less than 90°
Measures exactly 90°
Vertex

Point at which two lines of
an angle intersect
Circle

Radius

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Diameter

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Distance across a circle through its center
Circumference


Distance from the center of a circle to its
edge
Distance around the edge of a circle
Chord

Line across a circle that does not pass at
the circle’s center
Circle


Has 360°
Quadrant

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One fourth (quarter) of a circle
Measures 90°
Concentric

Two or more circles of different
sizes that share the same center
point
Triangles

Equilateral

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Isosceles

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All three sides are of equal length
and all three angles are equal
Two sides are of equal length
Scalene

Sides of three different lengths
and angles with three different
values
Triangles

Right Triangle


One of the angles equals 90°
Hypotenuse

The side of a right triangle that is
opposite the 90° angle
HYPOTENUSE
Quadrilaterals

Square


Rectangle


Four equal sides and all angles
equal 90°
Two sides equal lengths and all
angles equal 90°
Trapezoid

Only two sides are equal length
Quadrilaterals

Rhombus


All sides are equal length and
opposite angles are equal
Rhomboid

Opposite sides are equal length
and opposite angles are equal
Regular Polygons

Pentagon


Hexagon

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Five sided polygon
Six sided polygon
Octagon

Eight sided polygon
Regular Polygons

Distance across flats


Measurement across the
parallel sides of a polygon
FLATS
Distance across corners

Measurement across
adjacent corners of a
polygon
CORNERS
Solids

Prism

Right Rectangular

Right Triangular
Solids

Cylinder

Cone

Sphere
Solids

Pyramid

Torus
Geometric Terms

Circumscribe


Process of creating a
polygon that fully encloses a
circle and is tangent to all of
the polygons sides
Inscribe

Process of creating a
polygon that is fully
enclosed by a circle at its
corners
Geometric Terms

Bisect


Divide into two equal
parts
Tangent

A line and arc, or two
arcs that touch each
other at one point only
Geometric Terms

Parallel


Two or more lines
that are always the
same distance apart
Perpendicular

Two lines that are at a
90° angle
Geometric Symbols
Angle
Parallel
Triangle
Perpendicular
R Radius
Diameter
Square
CL Centerline