Geometry: Lines and Angles Flashcards

Questions and Answers

What is a point?

An exact location in space

What is a line?

A straight path of points that goes on and on in two directions

What is a line segment?

A part of a line that has two endpoints

What is a ray?

A part of a line that has one endpoint and continues on and on in only one direction Signup and view all the answers

What is an angle?

Formed by two rays that have the same endpoint Signup and view all the answers

What is a vertex?

The point where two rays meet or where the sides of a polygon meet or where three or more edges of a solid figure meet Signup and view all the answers

What is a right angle?

An angle that forms a square corner at 90 degrees Signup and view all the answers

What is an acute angle?

An angle that is less than a right angle (less than 90 degrees) Signup and view all the answers

What is an obtuse angle?

An angle that is greater than a right angle (greater than 90 degrees) Signup and view all the answers

What are parallel lines?

In a plane, lines that never intersect Signup and view all the answers

What are intersecting lines?

Lines that pass through the same point Signup and view all the answers

What are perpendicular lines?

Two lines that intersect to form right angles Signup and view all the answers

Study Notes

Points, Lines, and Angles

Point: Defines an exact location in space, often represented by a dot.
Line: A straight path extending infinitely in two opposite directions, composed of infinite points.
Line Segment: A portion of a line that has two distinct endpoints, unlike a full line.
Ray: A part of a line that starts at an endpoint and extends infinitely in one direction.

Angles

Angle: Created when two rays share a common endpoint, known as the vertex.
Vertex: The intersection point of two rays or the meeting point of polygon sides and edges in a solid figure.

Types of Angles

Right Angle: Measures exactly 90 degrees, forming a square corner.
Acute Angle: Measures less than 90 degrees, appearing sharp or narrow.
Obtuse Angle: Measures more than 90 degrees, appearing wider than a right angle.

Line Relationships

Parallel Lines: Never intersect in a plane, maintaining a constant distance apart.
Intersecting Lines: Two or more lines that cross at a single point.
Perpendicular Lines: Intersect at right angles, creating four 90-degree angles at the point of intersection.

Description

Explore the fundamental concepts of lines, line segments, rays, and angles through this set of flashcards. Each card provides a clear definition and explanation of key geometry terms essential for a solid understanding of the subject. Perfect for students looking to reinforce their knowledge in geometry.