GEOMETRY VOCABULARY AND DEFINITION
Set: Any collection of objects, numbers, or points.
Line Segment: Part of the line determined by 2 points and all points on the
line that lies between the 2 points
Intersection: The elements that 2 sets have in common; the points that the
2 geometric figures share
Ray: Part of a line that starts at a point and extends infinitely
Union: Joining together of any 2 sets (Think marriage)
Angle: Plane figure formed by 2 rays that share a common endpoint
Hypothesis: The “IF” portion of an “If-Then” statement. Also part of the
theorem that provides the GIVEN for any proof.
Conclusion: The “THEN” portion of an “If-Then” statement. Also part of the
theorem that provides the PROVE for any proof.
Congruent: Figures (such as angles) that can be made to coincide
Intuition: A way of drawing conclusions through insights (Think gut-feeling)
Midpoint: Point on a line that separates the line into 2 congruent lines
, Right Angles: Angles that have a measure of 90 degrees.
Valid Argument: An argument made where conclusion follows logically
from previously acceptable assumptions
Deduction: A way of drawing conclusions using established principles
Straight Angle: An angle that has a measure of 180 degrees
Induction: A way of drawing conclusions using specific observations or past
experiences
Collinear: Points that lie on the same line
Bisect: A ray that separates given angles into 2 smaller, congruent angles
Arc: Part of a circle determined by 2 points on a circle and every point
between them.
Radius: A line segment joined at the center of the circle to a point on the
circle
Intersect: Elements that 2 sets have in common.
Postulates: A statement assumed to be true
Set: Any collection of objects, numbers, or points.
Line Segment: Part of the line determined by 2 points and all points on the
line that lies between the 2 points
Intersection: The elements that 2 sets have in common; the points that the
2 geometric figures share
Ray: Part of a line that starts at a point and extends infinitely
Union: Joining together of any 2 sets (Think marriage)
Angle: Plane figure formed by 2 rays that share a common endpoint
Hypothesis: The “IF” portion of an “If-Then” statement. Also part of the
theorem that provides the GIVEN for any proof.
Conclusion: The “THEN” portion of an “If-Then” statement. Also part of the
theorem that provides the PROVE for any proof.
Congruent: Figures (such as angles) that can be made to coincide
Intuition: A way of drawing conclusions through insights (Think gut-feeling)
Midpoint: Point on a line that separates the line into 2 congruent lines
, Right Angles: Angles that have a measure of 90 degrees.
Valid Argument: An argument made where conclusion follows logically
from previously acceptable assumptions
Deduction: A way of drawing conclusions using established principles
Straight Angle: An angle that has a measure of 180 degrees
Induction: A way of drawing conclusions using specific observations or past
experiences
Collinear: Points that lie on the same line
Bisect: A ray that separates given angles into 2 smaller, congruent angles
Arc: Part of a circle determined by 2 points on a circle and every point
between them.
Radius: A line segment joined at the center of the circle to a point on the
circle
Intersect: Elements that 2 sets have in common.
Postulates: A statement assumed to be true
