## kymber How do you find perimeter of square if given the diagonal? one year ago one year ago

1. ParthKohli

Hey :)

2. saifoo.khan

After solving.

3. ParthKohli

It just involves pythagorean theorem.

4. saifoo.khan

|dw:1337701107499:dw|

5. ParthKohli

|dw:1337701083545:dw| Here it is. Just put in the formula: c^2 = 2a^2(a = b)(diagonal = c

6. saifoo.khan

5 is the value i just supposed?

7. kymber

It is 5, & I got 3.5, but it's wrong x_x

8. timo86m

d^2=2*s^2

9. timo86m

solve for s

10. kymber

?!!? baaah |dw:1337701419454:dw|

11. SMISHRA

Perimeter= 2x sqr rt2 x diagonal D

12. SMISHRA

Am i correct?

13. timo86m

d^2=2*s^2 Solve for s then it is s*4

14. Mathmuse

$d^2=s^2+s^2$ $d^2=2s^2$ $(d^2)/2=s^2$ $s=d/\sqrt{2}$ P=4*s $s=4*d/\sqrt{2}$ $s=2\sqrt{2}*d$

15. Mathmuse

last to s's should be P's

16. satellite73

1) divide by $$\sqrt{2}$$ to get the length of the side then 2) multiply by 4 to get the length of the perimeter

17. kymber

I got itttt. Thaanks errybody!