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Information Sheet -- Vocabulary Words
Term
Definition
angle
The distance between two rays sharing a common endpoint or two lines
that intersect. An angle has one vertex and two sides.
angles of a
circle
The angles formed within a circle. All angles in a circle add up to 360
degrees.
area
The size of the space contained within an enclosed two-dimensional
figure. Area is typically measured in square units such as square inches
or square centimeters.
bolt hole
pattern
A pattern used on some work-pieces in which a series of holes are
formed around an imaginary center.
central angle
An angle formed within a circle in which the center of the circle is the
vertex and the sides of the angle are radii.
circle
The figure formed by the group of points that are an equal distance
from a point, or center. The angles of a circle add up to 360 degrees.
circumference
The boundary or perimeter around a circle. Circumference measures the
distance around a circle.
concave
polygon
A polygon in which at least one of the angles is greater than 180
degrees.
convex polygon A polygon in which all angles are less than 180 degrees.
diameter
The distance from one edge of the circle to the opposite end through the
center. The radius is half the diameter.
hexagon
A polygon with six sides.
perpendicular
Two lines that intersect to form a 90° angle.
pi
A special constant value that relates the diameter of a circle to its
circumference. Pi, roughly 3.14, is used to find the circumference and
area of a circle.
point of
tangency
The point at which the tangent touches the circle.
polygon
A closed shape consisting of line segments that has at least three sides.
Triangles, quadrilaterals, rectangles, and squares are all types of
polygons.
quadrilateral
A polygon with four sides.
radii
The plural for radius. All radii on a given circle are equal in length.
radius
The distance from the center to the edge of a circle. If you multiply the
radius of a circle by two, the result is the diameter.
ratio
The relationship between two quantities expressed as a fraction.
regular
polygon
A polygon in which all angles and sides are equal.
semicircle
A half-circle. The angles of a semicircle add up to 180 degrees.
square
A polygon with four equal sides.
tangent
A line, line segment, or ray that touches a circle at exactly one point.
tangent point
Another way to describe the point of tangency.
triangle
A polygon with three sides.
vertex
The point of an angle where its two sides meet.
vertical angle
Two angles that share the same vertex and are positioned directly
opposite one another. Vertical angles are formed whenever two lines
intersect.
Two angles that share the same vertex and are positioned directly
vertical angles opposite one another. Vertical angles are formed whenever two lines
intersect.
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