Flashcards on Basic Elements of Geometry

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What is a point?

A point is a precise location in space with no dimensions.

Define a line.

A line is a straight path that extends indefinitely in both directions.

What is a line segment?

A line segment is a portion of a line with two defined endpoints.

Define a ray.

A ray is a portion of a line that starts at a specific point and extends infinitely in one direction.

What is an angle?

An angle is the union of two rays with a common endpoint.

Define parallel lines.

Parallel lines are two or more lines in the same plane that never intersect.

What is a perpendicular line?

A perpendicular line is a line that intersects another line at a 90-degree angle.

Define a polygon.

A polygon is a closed figure made up of line segments.

What is a triangle?

A triangle is a polygon with three sides and three angles.

Define a quadrilateral.

A quadrilateral is a polygon with four sides and four angles.

What is a circle?

A circle is a set of all points in a plane that are equidistant from a fixed center point.

Define perpendicular bisector.

A perpendicular bisector is a line or segment that cuts another line segment into two equal parts at a 90-degree angle.

What is a diagonal?

A diagonal is a line segment that connects two nonadjacent vertices in a polygon.

Define symmetry.

Symmetry is a balanced arrangement of parts or shapes that are identical or similar.

What is a tangent?

A tangent is a line or line segment that just touches a curve at a single point without crossing it.

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Test Your Knowledge


Which geometric element has no dimensions?



A line segment always has:



Which geometric element is formed by the union of two rays?



What is the shape of a triangle?



Which type of lines never intersect?



What is the definition of a quadrilateral?



Which geometric element connects nonadjacent vertices in a polygon?



What do we call a line that just touches a curve at a single point without crossing it?



What is the characteristic of symmetry in geometry?



A circle is a set of points that are equidistant from:




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