# geometry Flashcards

Browse 500 sets of geometry flashcards

right triangle

obtuse triangle

equilateral triangle

isosceles triangle

A triangle that has a 90 degree angle.

A triangle where one angle measures over 90 degrees.

A triangle with three congruent sides

A triangle with 2 congruent sides

right triangle

A triangle that has a 90 degree angle.

obtuse triangle

A triangle where one angle measures over 90 degrees.

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…

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…

plane

coplanar

plane geometry

solid geometry

a flat, two-dimensional surface that extends infinitely in all…

lying in the same plane

the study of figures that all lie in one plane

the study of objects that have three dimensions

plane

a flat, two-dimensional surface that extends infinitely in all…

coplanar

lying in the same plane

point

line

line segment

ray

a location in space

straight part of points that continues infinitely in both dire…

A part of a line with two endpoints

A part of a line that starts at one endpoint and extends forev…

point

a location in space

line

straight part of points that continues infinitely in both dire…

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…

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

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…

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

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

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…

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…

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

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

adjacent arcs

center of a circle

central angle of a circle

chord of a circle

Arcs of a circle that have exactly one point in common

The point from which all points on a circle are equidistant

An angle whose vertex is the center of a circle

A segment whose endpoints are on a circle

adjacent arcs

Arcs of a circle that have exactly one point in common

center of a circle

The point from which all points on a circle are equidistant

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…

right triangle

obtuse triangle

equilateral triangle

isosceles triangle

A triangle that has a 90 degree angle.

A triangle where one angle measures over 90 degrees.

A triangle with three congruent sides

A triangle with 2 congruent sides

right triangle

A triangle that has a 90 degree angle.

obtuse triangle

A triangle where one angle measures over 90 degrees.

adjacent angles

complentary angles

suplementary angles

linear pair

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

Two angles whose sum is 90 degrees

Two angles whose sum is 180 degrees

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

adjacent angles

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

complentary angles

Two angles whose sum is 90 degrees

Pythagorean Theorem

Converse of the Pythagorean Theorem

45-45-90 Triangle Theorem

30-60-90 Triangle Theorem

If a triangle is a right triangle, then the sum of the squares…

If the sum of the squares of the lengths of two sides of a tri…

In a 45-45-90 triangle, the legs are congruent and the length…

In a 30-60-90 triangle, the length of the hypotenuse is twice…

Pythagorean Theorem

If a triangle is a right triangle, then the sum of the squares…

Converse of the Pythagorean Theorem

If the sum of the squares of the lengths of two sides of a tri…

Angle Bisector

Median

Altitude

Circumcenter

A ray that divides an angle into two adjacent angles that are…

A segment whose endpoints are a vertex of the triangle and the…

The perpendicular segment from a vertex of a triangle to the o…

The point of concurrency of the perpendicular bisectors of a t…

Angle Bisector

A ray that divides an angle into two adjacent angles that are…

Median

A segment whose endpoints are a vertex of the triangle and the…