Unit 1 Test Geometry Basics Vocabulary

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Questions and Answers

What is a point?

An angle with a degree measure of 90 degrees

A location with no size or shape (correct)

A line that extends indefinitely in one direction

A measurable part of a line

What is a line?

Made up of points with no thickness or width.

What is a plane?

A flat surface made up of points and extends indefinitely in all directions.

What are collinear points?

Points that lie on the same line. Signup and view all the answers

What are non-collinear points?

Points that do NOT lie on the same line. Signup and view all the answers

What are coplanar points?

Points that lie on the same plane. Signup and view all the answers

What are non-coplanar points?

Points that do NOT lie on the same plane. Signup and view all the answers

What is a line segment?

A measurable part of a line consisting of two endpoints. Signup and view all the answers

What is the distance formula?

A formula used to find the distance between two points on a coordinate plane. Signup and view all the answers

What are congruent segments?

Segments that have the same length. Signup and view all the answers

What is the midpoint formula?

A formula used to find the midpoint between two endpoints. Signup and view all the answers

What is a segment bisector?

A segment, line, or plane that intersects a segment at its midpoint. Signup and view all the answers

What is a ray?

A line that extends indefinitely in one direction. Signup and view all the answers

What is an angle?

The intersection of two rays at an endpoint. Signup and view all the answers

What is a vertex?

The common endpoint of an angle (where the sides intersect). Signup and view all the answers

What is a right angle?

An angle with a degree measure of 90 degrees. Signup and view all the answers

What is an acute angle?

An angle with a degree measure of less than 90 degrees. Signup and view all the answers

What is an obtuse angle?

An angle with a degree measure greater than 90 degrees. Signup and view all the answers

What are congruent angles?

Angles that have the same measure. Signup and view all the answers

What are adjacent angles?

Two angles that share a common side and vertex; 'next to' each other. Signup and view all the answers

What are vertical angles?

Two angles directly across from each other on intersecting lines; always congruent. Signup and view all the answers

What are complementary angles?

Two angles with measures that have a sum of 90 degrees. Signup and view all the answers

What are supplementary angles?

Two angles with measures that have a sum of 180 degrees. Signup and view all the answers

What is a linear pair?

Adjacent angles that are supplementary. Combined, they form a straight line. Signup and view all the answers

What does it mean for lines to be perpendicular?

Two lines that intersect at a 90 degree angle (right angle). Signup and view all the answers

What is an angle bisector?

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

Study Notes

Geometry Basics Vocabulary

Point: Represents a location with no size or shape; foundational unit in geometry.
Line: Composed of infinitely many points, has length but no thickness or width; extends infinitely in both directions.
Plane: A flat two-dimensional surface made up of points; extends indefinitely in all directions.
Collinear Points: Points that exist on the same straight line; important for defining linear relationships.
Non-Collinear Points: Points that do not lie on a single straight line; essential in establishing dimensions in space.
Coplanar Points: Points that lie within the same plane; fundamental for discussing geometric shapes.
Non-Coplanar Points: Points that do not reside in the same plane; critical for understanding three-dimensional space.
Line Segment: Part of a line that consists of two distinct endpoints; measurable length.
Distance Formula: A mathematical tool used to calculate the distance between two points in a coordinate system, expressed as ( \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} ).
Congruent Segments: Two segments that have identical lengths; significant in construction and proof work.
Midpoint Formula: Formula for finding the midpoint of a line segment, given by ( \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right) ).
Segment Bisector: A line, ray, or plane that divides a segment into two equal parts at the midpoint.
Ray: Part of a line that extends infinitely in one direction, having one endpoint.
Angle: Formed by the intersection of two rays at a common endpoint, indicates rotational measurement.
Vertex: The point where two sides of an angle meet; essential reference point in angular measurements.
Right Angle: An angle measuring exactly 90 degrees; important in defining perpendicular lines.
Acute Angle: An angle measuring less than 90 degrees; significant in various geometric calculations.
Obtuse Angle: An angle measuring more than 90 degrees but less than 180 degrees; crucial for various applications.
Congruent Angles: Angles that share the same measure; important for triangle and shape congruency conditions.
Adjacent Angles: Two angles that share a common vertex and side, and do not overlap; crucial for angle relationships.
Vertical Angles: Angles that are opposite each other when two lines intersect; always equivalent in measure.
Complementary Angles: Two angles whose measures sum to 90 degrees; useful for solving geometric problems.
Supplementary Angles: Two angles whose measures sum to 180 degrees; often encountered in linear pair scenarios.
Linear Pair: A pair of adjacent angles that form a straight line and are supplementary.
Perpendicular Lines: Lines that intersect at a right angle (90 degrees); fundamental in constructing squares and rectangles.
Angle Bisector: A line or ray that splits an angle into two equal parts, essential for geometric constructions and proofs.

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Test your knowledge of essential vocabulary in geometry with this set of flashcards. Each term includes its definition to help reinforce your understanding of fundamental concepts. Perfect for students preparing for their Unit 1 test on geometry basics.