SSAT Elementary Level Math : How to find length of a line

Study concepts, example questions & explanations for SSAT Elementary Level Math

varsity tutors app store varsity tutors android store

Example Questions

Example Question #5821 : Ssat Elementary Level Quantitative (Math)

Find the length of a line connecting the points (1,3) and (7,8).

Possible Answers:

Correct answer:

Explanation:

To solve, simply use the distance formula. Thus,

It is important to remember that with the distance formula, you must keep the order of x2-x1 and y2-y1 consistent. It doesn't matter which point you choose to be 2 and which one you choose to be 1, but once you do, you must keep it in that order for both instances.

Example Question #664 : Geometry

On a line segment, there are two points.  One is at  and the other is at .  What is the distance of the line segment?

Possible Answers:

Correct answer:

Explanation:

When dealing with a number line, the distance of a point is measured in its distance from .  

 is a total of  points away from .  

 is more straight forward and is just  points away.  

To get the total distance you just add the two distances together 

.

Example Question #665 : Geometry

Find the length of the line shown below:

Screen shot 2015 11 04 at 7.48.31 pm

Possible Answers:

Correct answer:

Explanation:

In order to find the length of the line, you have to find the difference between the points.

The first point is 4, and the second point is 21. 

,

therefore the length of the line is  units. 

Learning Tools by Varsity Tutors