# Grade 9 Math: Linear Relations and Equations Intro to Lines

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### What is a line?

A straight one-dimensional figure having no thickness and extending infinitely in both directions
A closed interval corresponding to a finite portion of an infinite line.
the space between two intersecting lines or surfaces at or close to the point where they meet.
none of the above

### What is a line segment?

A closed interval corresponding to a finite portion of an infinite line
A half-infinite line with one of the two points A and B taken to be at infinity
A special point of a mathematical object, and is usually a location where two or more lines or edges meet
A closed interval corresponding to a finite portion of an infinite line

### What is a ray?

A ray is usually taken as a half-infinite line with one of the two points A and B taken to be at infinity.
The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
A ray is a special point of a mathematical object, and is usually a location where two or more lines or edges meet.
none of the above

### What is an angle?

The space between three intersecting lines or surfaces at or close to the point where they meet.
The space between two intersecting lines or surfaces at or close to the point where they meet.
The space between four intersecting lines or surfaces at or close to the point where they meet.
The space between five intersecting lines or surfaces at or close to the point where they meet.