## DorelTibi 2 years ago /Users/doreltibi/Desktop/Screen Shot 2012-12-31 at 1.17.06 PM.png

1. DorelTibi

2. DorelTibi

help

3. DorelTibi

help

4. aacehm

|dw:1356989474509:dw| Does knowing that you can divide a parallellogram into a rectangle and two triangles help?

5. DorelTibi

not really

6. aacehm

|dw:1356989718574:dw| |dw:1356989750298:dw|

7. DorelTibi

I think its like this: 144+b^2=400 b^2=266 b=16.3

8. aacehm

yep, that's the height of the rectangle, and you just need to find the length and multiply.

9. DorelTibi

how do u find the length

10. DorelTibi

?

11. DorelTibi

help

12. aacehm

well, think about it. If you cut that triangle off and put it back on, just on the other side, you're not changing the length at all

13. DorelTibi

so its twelve inches the length

14. aacehm

no, that's the length of the triangle you cut off. The length of the base of the parallelogram is the length.

15. DorelTibi

so the length is 20

16. aacehm

|dw:1356990749844:dw||dw:1356990808666:dw|

17. aacehm

see how that works?

18. DorelTibi

Im realy confused inorder to find the area i just have to multiply 20 and 16 and get 320

19. aacehm

area of a parallelogram is base times height. You correctly found the height, using the pythagorean theorem. Now, you need to figure out which one the base is. (It's the one perpendicular to the height, and it's not 20). I was giving you a picture so you could see why this particular formula works.

20. DorelTibi

is it 32

21. DorelTibi

@aacehm im i right

22. aacehm

yes, it's 32. I hope you understood how that worked.

23. DorelTibi

so the area would be 16*32

24. DorelTibi

yea?