# geometry Flashcards

Browse 500 sets of geometry flashcards

Collinear

Linear Pair

Supplementary angles

Vertical Angles

Points that lie on the same line

A pair of adjacent angles whose noncommon sides are opposite r…

Two angles whose sum is 180 degrees

A pair of opposite congruent angles formed by intersecting lin…

Collinear

Points that lie on the same line

Linear Pair

A pair of adjacent angles whose noncommon sides are opposite r…

Collinear

Linear Pair

Supplementary angles

Vertical Angles

Points that lie on the same line

A pair of adjacent angles whose noncommon sides are opposite r…

Two angles whose sum is 180 degrees

A pair of opposite congruent angles formed by intersecting lin…

Collinear

Points that lie on the same line

Linear Pair

A pair of adjacent angles whose noncommon sides are opposite r…

perpendicular bisector

angle bisector

median

centroid THEOREM

a perpendicular line that splits one side of a triangle into t…

a segment or ray that splits one angle into two congruent parts

a segment that passes through a vertex of a triangle and split…

the centroid splits the medians of triangles where the longer…

perpendicular bisector

a perpendicular line that splits one side of a triangle into t…

angle bisector

a segment or ray that splits one angle into two congruent parts

vertex

diagonal

regular polygon

concave polygon

A point where two sides meet.

a segment that connects opposite vertices

a polygon that is both equilateral and equiangular

has at least one diagonal with points outside the polygon

vertex

A point where two sides meet.

diagonal

a segment that connects opposite vertices

Angle of rotation

Line of reflection

Line of symmetry

Rotational symmetry

the angle through which a preimage is rotated to form the imag…

A line that a figure is flipped across to create a mirror imag…

a line that divides a figure into two halves that are mirror i…

A figure can be rotated less than 360 degrees around a central…

Angle of rotation

the angle through which a preimage is rotated to form the imag…

Line of reflection

A line that a figure is flipped across to create a mirror imag…

Collinear points

Coplanar points

Line segment

Ray

points that lie on the same line

points that lie in the same plane

a line that is connected by two points

a line connected by one point but goes on forever in one direc…

Collinear points

points that lie on the same line

Coplanar points

points that lie in the same plane

Acute angle

Acute triangle

Adjacent angles

Altitude of a triangle

angle whose measure is greater than 0 and less than 90

triangle that has three acute angles

angles that share a common vertex, a common side and no common…

a line segment extending from any vertex of a triangle perpend…

Acute angle

angle whose measure is greater than 0 and less than 90

Acute triangle

triangle that has three acute angles

Quadrilateral

Parallelogram

Rhombus

Rectangle

any four-sided polygon

a quadrilateral with opposite sides parallel

A parallelogram with four congruent sides

A parallelogram with four right angles

Quadrilateral

any four-sided polygon

Parallelogram

a quadrilateral with opposite sides parallel

Linear Pair

Supplementary Angles

Complementary Angles

Vertical Angles

A pair of angles that share a side and a vertex

Two angles that add to 180

Two angles that add to 90

A pair of opposite congruent angles formed by intersecting lin…

Linear Pair

A pair of angles that share a side and a vertex

Supplementary Angles

Two angles that add to 180

quadrilateral

Parallelogram

Rhombus

square

a four-sided polygon

a quadrilateral with both pairs of opposite sides parallel

A parallelogram with four equal sides

A quadrilateral with 4 sides that are equal and has all 90 deg…

quadrilateral

a four-sided polygon

Parallelogram

a quadrilateral with both pairs of opposite sides parallel

circumcenter

perpendicular bisector

bisect

centroid

The point of currency of the perpendicular bisectors of the si…

Bisects a segment and is perpendicular to it.

to cut exactly in half

The point of concurrency of the medians of a triangle

circumcenter

The point of currency of the perpendicular bisectors of the si…

perpendicular bisector

Bisects a segment and is perpendicular to it.

conjecture

converse

counterexample

deductive reasoning

an educated guess about what will always be true

a statement formed by interchanging the hypothesis and conclus…

a false example that shows a conjecture is not always true

using rules of logic to reach a conclusion

conjecture

an educated guess about what will always be true

converse

a statement formed by interchanging the hypothesis and conclus…

Acute Angles

Adjacent Angles

Alternate Exterior Angles -

Alternate interior angles

angles whose measure is >0 degrees and <90 degrees

two coplanar angles that have a common side and a common verte…

Angles that lie outside a pair of lines and on opposite sides…

angles between 2 lines and on opposite sides of a transversal

Acute Angles

angles whose measure is >0 degrees and <90 degrees

Adjacent Angles

two coplanar angles that have a common side and a common verte…

acute angle

right angle

obtuse angle

adjacent angles

an angle that measures less than 90 degrees

an angle that measures 90 degrees

An angle that measures more than 90 degrees but less than 180…

Two angles that share a common side and have the same vertex

acute angle

an angle that measures less than 90 degrees

right angle

an angle that measures 90 degrees

Dilation

What happens when a line is dilated and…

What happens when a line is dilated and…

Translation of a Figure (sliding motion)

A transformation that changes the size of an object, but not t…

The image is the SAME LINE

The image is a PARALLEL line

Translation is a transformation that moves points the same dis…

Dilation

A transformation that changes the size of an object, but not t…

What happens when a line is dilated and…

The image is the SAME LINE

point

line

plane

collinear

a location in space that has no dimension, named with a capita…

made up of points, named by any two points on the it OR a curs…

flat surface that extends in all directions, named by any thre…

on the same line

point

a location in space that has no dimension, named with a capita…

line

made up of points, named by any two points on the it OR a curs…

Isosceles Triangle Theorem

Converse of the Isosceles Triangle Theo…

Theorem 4-2 (Isosceles triangle/angle b…

Equilateral Triangle

If two sides of a triangle are congruent, then the angles oppo…

If two angles of a triangle are congruent, then the sides oppo…

If a line or line segment bisects the non-base angle of an iso…

A triangle that has all sides and all angles equal. (All angle…

Isosceles Triangle Theorem

If two sides of a triangle are congruent, then the angles oppo…

Converse of the Isosceles Triangle Theo…

If two angles of a triangle are congruent, then the sides oppo…

triangle angle sum theorem

exterior angle theorem

remote interior angles

corollary

the sum of the measures of a triangle is 180

the measure of an exterior angle of a triangle is the sum of t…

two angles not adjacent to the exterior angle

a theorem with a proof that follows as a direct result

triangle angle sum theorem

the sum of the measures of a triangle is 180

exterior angle theorem

the measure of an exterior angle of a triangle is the sum of t…

Transformation

Types of Transformation

Pre-Image

Image

Function of mapping that results in change in position, shape,…

Translation ... Reflection ... Rotation ... Dilation

Original image

Figure resulting from transformation of pre-image

Transformation

Function of mapping that results in change in position, shape,…

Types of Transformation

Translation ... Reflection ... Rotation ... Dilation

Point

scalene triangle

line

segment

An exact location represented by a dot.

a triangle with no congruent sides

A straight path that goes without end in two directions.

part of a line with 2 endpoints

Point

An exact location represented by a dot.

scalene triangle

a triangle with no congruent sides

Supplementary Angles

Point

Line

Plane

Two or more angles that add to 180 degrees

A location with no size

An infinite number of points on a straight path that extends i…

An infinite number of points and lines on a flat surface that…

Supplementary Angles

Two or more angles that add to 180 degrees

Point

A location with no size

Collinear

Linear Pair

Supplementary angles

Complementary angles

Points that lie on the same line

A pair of adjacent angles whose noncommon sides are opposite r…

Two angles whose sum is 180 degrees

Two angles whose sum is 90 degrees

Collinear

Points that lie on the same line

Linear Pair

A pair of adjacent angles whose noncommon sides are opposite r…

Inductive Reasoning

Conjecture

Counterexample

Conditional Statement

It is used to draw a conclusion based on a pattern.

An educated guess based on know information

It is an example that proves a conjecture or statement is fals…

A statement written in if then form with a hypothesis and conc…

Inductive Reasoning

It is used to draw a conclusion based on a pattern.

Conjecture

An educated guess based on know information