Alternate Interior Angles

Angles located on opposite sides of the transversal, and inside the parallel lines. They are congruent. Form a 'Z' shape.

The common endpoint of an angle, where two or more lines meet. Also, the name for a corner of a polygon.

Angles that are in the same position on different lines; an exact match/copy. They are congruent. Forms an 'F' shape.

Same Side Interior Angles

Angles on the same side of the transversal and inside the parallel lines. They are supplementary. Form a 'C' shape.

Part of a line with two endpoints.

Straight figure extending infinitely in both directions

A figure formed by two rays with a common endpoint, called the vertex

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 degrees

An angle that measures 180 degrees

An angle that measures 360 degrees

Equal in measure (length or angle measurement)

A triangle with two congruent sides and two congruent angles

A triangle with no congruent sides

A triangle with three congruent sides and angles

A triangle with one angle equal to 90 degrees

The point where all the medians of a triangle meet

A segment from a vertex to the midpoint of the opposite side. It bisects the opposite side.

A ray that divides an angle into two congruent angles

Perpendicular Bisector

A line that is perpendicular to a segment at its midpoint

Altitude of a Triangle

A perpendicular segment drawn from a vertex to the opposite side

A triangle with all angles measuring less than 90 degrees

A triangle with one angle that measures more than 90 degrees

A transformation that preserves length and angle measure

A transformation that 'flips' a figure over a mirror or reflection line.

A transformation that 'turns' a figure around a point

A transformation that 'slides' a figure a given distance and direction

The point around which a figure is rotated

The ordering of the vertices of a polygon. This is reversed when a figure undergoes a rotation.

A transformation that changes the size of an object, but not the shape.

Provide the name for each of the following polygons: 3-sided polygon 4-sided polygon 5-sided polygon 6-sided polygon 8-sided polygon 9-sided polygon 10-sided polygon

Triangle (3-sided polygon) Quadrilateral (4-sided polygon) Pentagon (5-sided polygon) Hexagon (6-sided polygon) Octagon (8-sided polygon) Nonagon (9-sided polygon) Decagon (10-sided polygon)

There is a sequence of rigid motions that maps one figure onto the other.

Statement that makes a geometrical object congruent to itself. Often used when two polygons share a common side or angle.

Geometry Vocabulary Flashcards

Student preview

46 questions

Show all answers

1.

FLASHCARD QUESTION

Front

Parallel lines

Back

Two lines that never intersect

2.

FLASHCARD QUESTION

Front

Perpendicular lines

Back

Two lines that form right angles

3.

FLASHCARD QUESTION

Front

Complementary angles

Back

Two angles whose sum is 90 degrees

4.

FLASHCARD QUESTION

Front

Supplementary angles

Back

Two angles whose sum is 180 degrees

5.

FLASHCARD QUESTION

Front

Linear Pair

Back

Two adjacent angles that form a straight line (angle)

6.

FLASHCARD QUESTION

Front

Adjacent Angles

Back

Angles that are immediately next to each other

7.

FLASHCARD QUESTION

Front

Vertical Angles

Back

Two angles that are formed by the intersection of two straight lines and are across from each other. These angles are congruent (equal) and form the 'bow tie' shape.

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