## anonymous one year ago Graph quadrilateral JKLM with Vertices J(-3,-3), K(1,-3), L(1,4), and M(-3, 1). What is the perimeter of JKLM?

1. EmmaTassone

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2. EmmaTassone

Just graph the points and join them with lines,then you will get the quadrilateral.

3. EmmaTassone

After that to calculate the perimeter you have to sum every side of the quadrilateral. So first you need the lenght of each side to sum them.

4. anonymous

Yeah, so KL=7 JK=4 JM=4 and LM=2.6 which equals 17 .6 for me

5. EmmaTassone

how did you get the lenght?

6. anonymous

4(-3)=7, 1-(-3)=4, -3-1=4, sqrt(1-4)^2+(-3-1)^2

7. EmmaTassone

and how did you get 2.6 for LM?

8. anonymous

The last one sqrt(1-4)^2+(-3-1)^2

9. EmmaTassone

yep, but you did it wrong.

10. anonymous

Oh .-. Ah. Yeah ;v;. How so?

11. EmmaTassone

$\sqrt{(1-4)^{2}+(-1-3)^{2})}= \sqrt{(-3)^2+(-4)^2} = \sqrt{9 + 16} = \sqrt{25} = 5$

12. EmmaTassone

thats the way how you should solve the square root

13. anonymous

Ahhhh, so I wrote 4 instead of -4 and it wrecked everything :) Thanks, got it

14. EmmaTassone

equally you got the solution because of luck xD because thats not the formula to find the length between two points. The true formula for two points (a1,b1) and (a2,b2) in the plane is:$Lenght= \sqrt{(a _{1}-a _{2})^2+(b _{1}-b _{2})^2}$

15. EmmaTassone

Hope it helps

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