Basic Geometry Definitions (Round 1)

Front

Points P, Q, and R are _____________.

Back

Collinear: Points that lie on the same straight line.

Front

A __________ is a part of a line that has one endpoint and extends infinitely in one direction.

Back

Ray: A ray starts at a point and goes on forever in one direction.

Front

A __________ is a straight path that extends infinitely in both directions.

Back

Line: A line has no endpoints and is straight.

Front

Lines with the same slope are _____________.

Back

Parallel: Parallel lines never intersect and are always the same distance apart.

Front

This formula is used for _____________.

Back

Distance: The formula for distance between two points (x1, y1) and (x2, y2) is √((x2 - x1)² + (y2 - y1)²).

Front

A __________ is a flat surface that extends infinitely in all directions.

Back

Plane: A plane has no thickness and is defined by three non-collinear points.

Front

The point where two lines intersect is called a __________.

Back

Point of Intersection: The point at which two lines meet.

Front

A __________ is a figure formed by two rays with a common endpoint.

Back

Angle: An angle is measured in degrees and can be acute, right, or obtuse.

Front

The distance between two points on a line is called a __________.

Back

Line Segment: A line segment has two endpoints.

Front

Two lines that meet at a right angle are called __________ lines.

Back

Perpendicular: Perpendicular lines intersect at 90 degrees.