# ISEE Lower Level Quantitative : How to find length of a line

## Example Questions

### Example Question #402 : Isee Lower Level (Grades 5 6) Quantitative Reasoning

On a number line, what is the length of a line that stretches from to ?

Explanation:

is units to the left of zero on the number line.  is units to the right of zero on the number line.

The length of the line would then be .

### Example Question #1 : How To Find Length Of A Line

If the radius of a circle is equal to , then what is the value of the diameter?

Explanation:

The length of a dimater is twice the length of the radius. Given that the length of the radius is , the dimater will be equal to .

### Example Question #1 : How To Find Length Of A Line

The length of  is  and the length of  is .

What is the length of  in terms of  and ?

Explanation:

Using the segment addition postulate, we know that .  We can substitute  and  for  and  and solve for .

Substitute:

Subtract y from both sides:

Simplify:

### Example Question #1 : How To Find Length Of A Line

The length of BC is x and the length of CE is y.

What is the length of segment ?

Explanation:

Segments  and  make up segment .  Using the segment addition postulate, add the lengths of  and  to find the length of .

Substitute  and :

### Example Question #2 : How To Find Length Of A Line

The length of  is  and the length of  is .

What is the length of segment ?

Explanation:

Using the segment addition postulate, we know that .  We can substitute  and  for  and  and solve for .

Substitute:

Subtract y from both sides:

Simplify:

### Example Question #2 : How To Find Length Of A Line

The length of  is  and the length of  is .

What is the length of segment  in terms of  and ?