GED Math : Coordinate Geometry

Study concepts, example questions & explanations for GED Math

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Example Questions

Example Question #1 : Distance Formula

Find the distance from point  to .

Possible Answers:

Correct answer:

Explanation:

Write the formula to find the distance between two points.

Substitute the points into the radical.

The answer is:  

Example Question #1 : Distance Formula

What is the distance between  and ?

Possible Answers:

Correct answer:

Explanation:

Write the distance formula.

Substitute the points into the equation.

The answer is:  

Example Question #1 : Distance Formula

Use distance formula to find the distance between the following two points.

 

Possible Answers:

Correct answer:

Explanation:

Use distance formula to find the distance between the following two points.

 

Distance formula is as follows:

Note that it doesn't matter which point is "1" and which point is "2" just so long as we remain consistent.

So, let's plug and chug.

So, our answer is

Example Question #1 : Distance Formula

A triangle on a coordinate plane has the following vertices: . What is the perimeter of the triangle?

Possible Answers:

Correct answer:

Explanation:

Since we are asked to find the perimeter of the triangle, we will need to use the distance formula to find the length of each side. Recall the distance formula:

Start by finding the distance between the points :

Next, find the distance between .

Then, find the distance between .

Finally, add up the lengths of each side to find the perimeter of the triangle.

Example Question #2 : Distance Formula

Find the distance between the points  and .

Possible Answers:

Correct answer:

Explanation:

Find the distance between the points  and .

To find the distance between two points, we will use distance formula (clever name). Distance formula can be thought of as a modified Pythagorean Theorem. What distance formula does is essentially treats our two points as the ends of a hypotenuse on a right triangle, then uses the two side lengths to find the hypotenuse.

Distance formula:

Pythagorean Theorem

If the connection isn't clear, don't worry, we can still solve for distance.

So our answer is 407

Example Question #841 : Geometry And Graphs

What is the distance between the points  and ?

Possible Answers:

Correct answer:

Explanation:

Recall the distance formula:

Plug in the given points to find the distance between them.

The distance between those points is .

Example Question #842 : Geometry And Graphs

Find the length of the line connecting the following points.

 

Possible Answers:

Correct answer:

Explanation:

Find the length of the line connecting the following points.

 

To find the length of a line, use distance formula.

What we are really doing is making a right triangle and using Pythagorean Theorem to find the hypotenuse. 

Let's plug in our points and find the distance!

So our answer is 110

Example Question #841 : Geometry And Graphs

What is the distance between the points  and ?

Possible Answers:

Correct answer:

Explanation:

Remember that you can consider your two points as:

 and 

From this, remember that the distance formula is:

Now, for your data, this is:

or

You can simplify this value a little. Identify the prime factors of  and move any number that appears in a pair of factors from the interior to the exterior of the square root symbol:

 

Example Question #131 : Coordinate Geometry

What is the distance between the two points  and ?

Possible Answers:

Correct answer:

Explanation:

Remember that you can consider your two points as:

 and 

From this, remember that the distance formula is:

Now, for your data, this will look like the following.  Be very careful with the negative signs:

or

 is only factorable into  and ; therefore, your answer is in its final form already.

Example Question #1 : Graphing Lines

A line has slope  and -intercept . Give its -intercept.

Possible Answers:

Correct answer:

Explanation:

The -intercept will be a point  for some value . We use the slope formula

,

setting ,

and solving for :

The -intercept is .

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