Points, Lines and Planes Review

Front

What is a point in geometry?

Back

A point is a specific location in space that has no size or dimension.

Front

Define a line in geometry.

Back

A line is a straight one-dimensional figure that extends infinitely in both directions with no endpoints.

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

What is a ray in geometry?

Back

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

Front

What is a plane in geometry?

Back

A plane is a flat two-dimensional surface that extends infinitely in all directions.

Front

What does it mean for a line to lie in a plane?

Back

It means that all points on the line are also contained within the plane.

Front

How do you find the endpoint of a segment given one endpoint and the midpoint?

Back

Use the midpoint formula: Midpoint = (x1 + x2)/2, (y1 + y2)/2. Rearrange to find the unknown endpoint.

Front

What is the midpoint of a segment?

Back

The midpoint is the point that divides the segment into two equal parts.

Front

If Q is the midpoint of PR, what is the relationship between PQ and QR?

Back

PQ = QR; they are equal in length.

Front

What is the formula to find the length of a segment given its endpoints?

Back

Length = √((x2 - x1)² + (y2 - y1)²).