# Thread: help with Cartesian coordinate system, never heard of it?

1. ## help with Cartesian coordinate system, never heard of it?

Hi in my class we started diving into this cartesian system i have never heard if this and it seemed like no one else had eithier. I am about to take the final wenesday and have some questions i need to review. If you could help me with the problems below that would be awesome. ALso i know this is some easy looking stuff but its really nothing i have worked with before

1.)The distance between the two points and is ?

2.)Find the distance between the two points, and

3.)Plot the points , , and . Notice that these points are vertices of a right triangle (the angle is 90 degrees).
Find the distance between and :
Find the distance between and :
Find the area of the triangle :

2. Originally Posted by Duffmac
Hi in my class we started diving into this cartesian system i have never heard if this and it seemed like no one else had eithier. I am about to take the final wenesday and have some questions i need to review. If you could help me with the problems below that would be awesome. ALso i know this is some easy looking stuff but its really nothing i have worked with before

1.)The distance between the two points and is ?

2.)Find the distance between the two points, and

3.)Plot the points , , and . Notice that these points are vertices of a right triangle (the angle is 90 degrees).
Find the distance between and :
Find the distance between and :
Find the area of the triangle :
Hi Duffmac,

Did you miss that class?

Lookie here for Cartesean Coordinate System.

Lookie here for the Distance Formula.

3. No i didnt miss it , it was strange we kinda just dove into it and the teacher basically stated in a rather rude way its our job to learn this material.I know its easier stuff but it kinda threw me off.

But thanks for the links those help alot , i need some kind of explanation like that

4. Hi thanks for the help i really need it , i just got back from class and am working through these problems , i actually got it very easily after your posted links and provide the correct answers below

1.)The distance between the two points and is ?

2.)Find the distance between the two points, and

3.)3.)Plot the points , , and
*answer distance between A and B =4.1231
* answer distance between A and C =8.2462
*answer to area =? i thought it would be 1/2 base times height the base being B=7.1419 times the height which is 8.2462?
anyone got the answer fr the last one? i cant figure it out

5. Use the formula you've memorized (or else look it up, and memorize it now) for the area A of a triangle with base length b and height h.

6. Originally Posted by Duffmac
Hi thanks for the help i really need it , i just got back from class and am working through these problems , i actually got it very easily after your posted links and provide the correct answers below

1.)The distance between the two points and is ?

2.)Find the distance between the two points, and

3.)3.)Plot the points , , and
*answer distance between A and B =4.1231 ${\color{red}\sqrt{17}}$
* answer distance between A and C =8.2462 ${\color{red}\sqrt{68}}$
*answer to area =? i thought it would be 1/2 base times height the base being B=7.1419 times the height which is 8.2462? anyone got the answer fr the last one? i cant figure it out
$\overline {AB} \perp \overline {AC}$

$AB=\sqrt{17}$

$AC=\sqrt{68}$

$A=\frac{1}{2}(\sqrt{17})(\sqrt{68})$

7. Ok the area is 17 , pheww took me awhile but i honestly think pawing through it really helped me understand it good, thanks alot guys! i will practice some more and hopefully Ace my exam.