Geometry Vocabulary
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Point
represents a location, has no width or thickness

Line
has immeasurable length, no width or thickness, and is made up of infinite points, must have 2 points to define a line

Line Segment
part of a line with measurable length

Ray
part of a line with one endpoint and extends in one direction

Plane
a flat surface with width and length, but no thickness

What defines a plane?
3 points on the same line

Collinear Points
points that lie on the same line

NonCollinear Points
points that do NOT lie on the same line

Coplanar Points
points that lie in the same plane

NonCoplanar Points
points that do NOT lie in the same plane

Skew Lines
lines in different planes that never intersect and are not parallel

Congruent
equal in measure

Midpoint
a point that divides a segment into 2 congruent parts

Bisector
a line that divides a segment/angle into 2 congruent parts

Parallel Lines
lines that never intersect

Perpendicular Lines
lines that intersect at right angles (90^{o})

Angle
the intersection of 2 rays at a common endpoint (called a vertex)

Acute Angle
measures less than 90^{o}

Obtuse Angle
measures greater than 90^{o} and less than 180^{o}

Right Angle
measures 90^{o}

Complementary Angles
2 or more angles whose sum is 90^{o}

Supplementary Angles
2 or more angles whose sum is 180^{o}

Adjacent Angles
2 angles that share a common vertex and common ray

Linear Pair
2 adjacent angles that are supplementary

Congruent Angles
angles with the same measure

Vertical Angles
2 angles formed by 2 intersecting lines "across from each other" and are congruent

Transversal
a line that intersects 2 or more lines at different points

Interior Angles
inside angles

Exterior Angles
outside angles

Corresponding Angles
same position angles on different lines

Conditional Statement
any statement that can be written in IFTHEN form

Hypothesis
the part in a Conditional Statement after the IF

Conclusion
the part in a Conditional Statement after the THEN

Axiom
a statement that is accepted as true and applies to math in general

Postulate
a statement accepted as true and applies to a specific branch of math (like Geometry)

Theorem
a statement that can be proven true using terms, definitions, and postulates

Converse
switches the hypothesis and conclusion in a conditional statement