# Homework Help: Area Of Paralellogram

1. Aug 5, 2009

### TheAkuma

What are the formulas to find out the area of a parallelogram? Yep, that's as much detail I can put in.

2. Aug 5, 2009

### CRGreathouse

Height times width. In this picture, b * h:

3. Aug 5, 2009

### pbandjay

A = b*h

A - Area
b - length of base
h - height

4. Aug 5, 2009

### TheAkuma

Thanks. Is that it? wow its pretty simple.

5. Aug 5, 2009

### n!kofeyn

Can you derive this formula though? Try breaking up the parallelogram into shapes that you know the area of (i.e. rectangle and right triangles), and then add up those areas to see if you get base*height for your area equation. This should be good practice for you.

6. Aug 5, 2009

### TheAkuma

Actually, the parallelogram is from a graph which means I should know the coordinates. Oh and I just forgot! I have to solve it by algebraic means.

7. Aug 5, 2009

### Dragonfall

Last edited: Aug 5, 2009
8. Aug 6, 2009

### TheAkuma

So its ad-bc then eh? By looking at the diagram on wiki. Can a,b,c & d be x and y values? Or am I completely off track?

9. Aug 6, 2009

### TheAkuma

oh no wait! do they represent vectors?

10. Aug 6, 2009

### Dragonfall

They are vectors.

11. Aug 6, 2009

### snipez90

If you know the lengths of two adjacent sides of the parallelogram and the value of any of its angles. Then the area of the parallelogram is ab*sin(theta), where a and b are the adjacent sides and theta is the angle.

12. Aug 7, 2009

### TheAkuma

thanks, I just hope I get it right.

13. Aug 7, 2009

### TheAkuma

hang on, why don't I just post the question from the assignment.
"Find the area enclosed by the four tangents by geometrical and algebraic means."

14. Aug 8, 2009

### rock.freak667

what 4 tangents now?

15. Aug 8, 2009

### TheAkuma

from the linear graph i made.

16. Aug 8, 2009

### rock.freak667

then you can find the coordinates of each corner of the parallelogram and use any of the above methods posted.

17. Aug 8, 2009

### TheAkuma

And that's using geometrical and algebraic methods yeah? thanks.