Unit 1 Geometry Flashcards

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Questions and Answers

What does collinear mean?

When three or more points lie on a straight line.

What are complementary angles?

Two angles that add up to 90 degrees.

What does congruent mean?

The same shape and same size.

What does coplanar mean?

Points, lines, segments, or any geometric shapes that lie on the same plane. Signup and view all the answers

What is an endpoint?

A point at which a line segment or ray ends. Signup and view all the answers

What is a line?

A straight one-dimensional figure extending infinitely in both directions. Signup and view all the answers

What is a linear pair?

A pair of adjacent angles that form a straight line. Signup and view all the answers

What is an obtuse angle?

An angle that measures more than 90 degrees but less than 180 degrees. Signup and view all the answers

What are opposite rays?

Two rays that have a common endpoint and point in opposite directions. Signup and view all the answers

What are parallel lines?

Distinct lines in the same plane that never intersect. Signup and view all the answers

What are parallel planes?

Two planes that do not intersect. Signup and view all the answers

What is a plane in geometry?

A flat surface that extends infinitely in all directions. Signup and view all the answers

What is a point?

An exact location with no size, only position. Signup and view all the answers

What is a ray?

A part of a line that begins at an endpoint and extends infinitely in one direction. Signup and view all the answers

What are skew lines?

Two non-parallel lines in space that do not intersect. Signup and view all the answers

What is a straight angle?

An angle that measures 180 degrees. Signup and view all the answers

What are supplementary angles?

Two angles that add up to 180 degrees. Signup and view all the answers

What is an unidentified term in geometry?

Terms like point, line, and plane that are not formally defined. Signup and view all the answers

What is a vertex?

A point where two or more straight lines meet. Signup and view all the answers

What are vertical angles?

Angles formed when two lines intersect that are opposite each other. Signup and view all the answers

What is a midpoint?

The point that is halfway between the endpoints of a line segment. Signup and view all the answers

What is a line segment?

The part of a line that connects two points. Signup and view all the answers

What is a segment bisector?

A line, ray, or segment that divides a line segment into two equal parts. Signup and view all the answers

What is an angle bisector?

A ray that divides an angle into two equal parts. Signup and view all the answers

What is an acute angle?

An angle that measures less than 90 degrees. Signup and view all the answers

What are adjacent angles?

Two angles that share a common vertex and side, and do not overlap. Signup and view all the answers

What is an axiom or postulate?

A rule or statement accepted without proof. Signup and view all the answers

Study Notes

Geometry Terms and Definitions

Collinear refers to three or more points lying on a straight line; any two points are always collinear.
Complimentary angles add up to 90 degrees; they do not need to be adjacent.
Congruent shapes have the same size and form.
Coplanar entities lie on the same two-dimensional plane, including points, lines, and shapes.
An endpoint marks the termination of a line segment or ray.
A line is a straight, one-dimensional figure extending infinitely in both directions, determined uniquely by any two points.
Linear pairs consist of two adjacent angles whose measures add up to 180 degrees, forming a straight line; if one angle is acute, the other is obtuse.
Obtuse angles measure more than 90 degrees but less than 180 degrees.
Opposite rays share a common endpoint and extend in opposite directions, forming a straight line.
Parallel lines are distinct lines in the same plane that never intersect and share the same slope.
Parallel planes are non-intersecting flat surfaces; shapes like cubes have three sets of these planes.
A plane is a flat two-dimensional surface extending infinitely in all directions, defined by any three non-collinear points.
A point represents an exact location with no dimensions, only a positional value.
A ray starts at an endpoint and extends infinitely in one direction, named according to its starting point and direction.
Skew lines are non-parallel lines in space that do not cross each other.
A straight angle measures 180 degrees and appears as a straight line, indicating a complete reversal of direction.
Supplementary angles have measures that sum to 180 degrees; they can be non-adjacent.
Undefined terms in geometry include point, line, and plane, which are foundational yet not formally defined.
A vertex is where two or more lines meet, creating a corner or intersection.
Vertical angles are the opposite angles formed when two lines intersect; they are congruent.
The midpoint of a segment is equidistant from its endpoints; in a coordinate plane, it's calculated as ((x1 + x2)/2, (y1 + y2)/2).
A line segment connects two points and has definite endpoints.
A segment bisector divides a line segment into two equal parts, intersecting at the midpoint.
An angle bisector is a ray that divides an angle into two equal measures; it can also be represented by a line or line segment.
Acute angles measure less than 90 degrees.
Adjacent angles share a vertex and a common side, remaining non-overlapping.
An axiom or postulate is a foundational statement accepted without proof in geometry.

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Description

Explore essential geometry terms with these flashcards for Unit 1. Each card provides definitions for key concepts such as collinear points, complimentary angles, and congruence. Perfect for mastering geometric principles and preparing for exams.