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Terms for the Algebra/Geometry Midterm


An exact location


A flat surface extending in 2 directions without end (name using 3 NON-colinear points)


The set of all points


Points extending in opposite directions without end


A portion of a line between 2 end points


A portion of a line with 1 endpoint that extends in 1 direction to infinity


The intersection of 2 rays

Acute angle

An angle whose measure is less than 90 degrees

Right angle

An angle whose measure equals 90 degrees

Obtuse angle

An angle whose measure is between 90 and 180 degrees

Straight angle

An angle whose measure equals 180 degrees


Means points on the same line

Complementary angles

Two angles whose sum is 90 degrees

Supplementary angles

Two angles, of whose sum is 180 degrees


Points in the same plane


a parallelogram with all four sides forming right angles


Point in the middle of a segment

Opposite rays

Rays that are going in opposite directions and share the endpoint


Lines in the plane that do not intersect.


Lines that intersect forming right angles

Skew lines

Lines that are in different planes that do not intersect

Acute triangle

A triangle in which all the angles are less than 90 degrees

Scalene triangle

A triangle with none of the sides being congruent

Isosceles triangle

A triangle with at least 2 that are congruent

Equilateral triangle

A triangle with equal sides


The set of all points in a plain equal distance from a center point


Equal distance

Regular polygon

A polygon with all the angles and sides being congruent

Major arch

An arch whose measure is more than 180 degrees


An arch whose measure equals 180 degrees


A quadrilateral whose opposite sides are both parallel


A parallelogram with all 4 sides being congruent and forming right angles


A quadrilateral with 1 pair of opposite sides being parallel


When a figure is an enlargement or reduction of a original figure


When the pre-image and the final image are congruent


A similarity transformation (can be a enlargement or a reduction)


The "shift" of a figure over parallel lines of reflection (orientation is the same)


The reflection of a figure over 2 intersecting lines (orientation is the same)

Glide Reflection

The reflection of a figure over at least 3 intersecting lines


A repeated geometric pattern that covers a plane

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