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![[Post New]](/templates/default/images/icon_minipost_new.gif) 29 Mar 2008 12:11:00 IST
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Find the area of a pentagon whose vertices are (4,1) (3,6) (-5,1) (-3,3) (-3,0). IN HOW MANY WAYS THIS AREA CAN BE FOUND?
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I LIKE HARRY POTTER BOOKS, GAMES, MOVIES, THEMES, WALLPAPERS, ANIMATIONS ETC. I HAVE COMPLETED READING ALL POTTER BOOKS, GAMES AND SEEN ALL THE MOVIES AND I OWN THE SAME.
I AM A BIG FAN IF J.K.ROWLING AND WARNER BROTHERS.
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30 Mar 2008 09:55:16 IST
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use the method of determinants
solve it like this
| | = stands for determinants
| x1 y1| + | x2 y2 | + | x3 y3 | + | x4 y4 | + | x5 y5 |
| x2 y2 | | x3 y3 | | x4 y4 | | x5 y5 | | x1 y1 |
= (x1y2 - x2y1) + (x2y3 - x3y2) + (x3y4 - x4y3) + (x4y5 - x5y4) + (x5y1 + x1y5)
put values and get the ans.
another method can be divide it into three triangles now u know the vertices of all the triangles use above method to find area of triangle
and add them....
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I DONOT FOLLOW THE RULES I MAKE THEM TO FOLLOW ME. |
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