A straight one-dimensional figure having no thickness and extending infinitely in both directions.

A part of a line that is bounded by two distinct endpoints.

A point at one end of a segment or the starting point of a ray.

A part of a line that starts at an endpoint and extends infinitely in one direction.

Two rays that share the same endpoint and extend in opposite directions.

A statement that is accepted as true without proof.

A statement that has been proven on the basis of previously established statements.

A statement or proposition that is regarded as being established, accepted, or self-evidently true.

Having the same size and shape.

The point that divides a segment into two congruent segments.

A set of values that show an exact position.

A line, segment, ray, or plane that intersects a segment at its midpoint.

A figure formed by two rays, called the sides of the angle, sharing a common endpoint.

An angle that measures less than 90 degrees.

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

An angle that measures exactly 90 degrees.

An angle that measures exactly 180 degrees.

A judgment or decision reached by reasoning.

Two angles that have a common side and a common vertex.

Two angles whose measures add up to 90 degrees.

Two angles whose measures add up to 180 degrees.

The angles opposite each other when two lines cross. They are always equal.

A line or ray that divides an angle into two congruent angles.

A tool used for drawing straight lines.

A tool used to draw circles or arcs.

geometric construction

The process of drawing geometric shapes using only a compass and straightedge.

perpendicular bisector

A line that divides a line segment into two equal parts at 90 degrees.

A tool used to measure distances or to draw straight lines.

The size, length, or amount of something, typically as established by measuring.

A two-dimensional surface on which points are plotted and located by their coordinates.

A formula used to find the midpoint between two points in a coordinate plane.

A formula used to determine the distance between two points in a plane.

The continuous line forming the boundary of a closed geometric figure.

The extent or measurement of a surface or piece of land.

The distance around the edge of a circle.

A quadrilateral with four right angles.

A quadrilateral with four equal sides and four right angles.

A round plane figure whose boundary consists of points equidistant from the center.

A polygon with three edges and three vertices.

A line segment from the center of a circle to any point on its circumference.

A line segment that passes through the center of a circle and has its endpoints on the circle.

A pair of adjacent angles formed when two lines intersect. The angles in a linear pair are supplementary, so their measures add up to 180 degrees.

Geometry Terms - Chapter 1 Flashcards

Student preview

50 questions

Show all answers

1.

FLASHCARD QUESTION

Front

polygon

Back

A closed two-dimensional figure with three or more sides, where each side meets exactly two other sides at their endpoints.

2.

FLASHCARD QUESTION

Front

net

Back

A two-dimensional pattern that can be folded to make a three-dimensional solid.

3.

FLASHCARD QUESTION

Front

isometric drawing

Back

A method for visually representing three-dimensional objects in two dimensions.

4.

FLASHCARD QUESTION

Front

orthographic drawing

Back

A way of representing a three-dimensional object in two dimensions with three two-dimensional views : front, top, and right side.

5.

FLASHCARD QUESTION

Front

conjecture

Back

An unproven statement that is based on observations.

6.

FLASHCARD QUESTION

Front

point

Back

An exact location in space, typically represented by a dot.

7.

FLASHCARD QUESTION

Front

plane

Back

A flat, two-dimensional surface that extends infinitely far.

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