Determine the area of the quadrilateral whose vertices are (1,3), (6,5), (9,1) and (3,-3).

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- Nov 30th 2009, 05:20 AMsharkmanQuadrilateral Area
Determine the area of the quadrilateral whose vertices are (1,3), (6,5), (9,1) and (3,-3).

- Nov 30th 2009, 05:51 AMmathaddict
HI sharkman ,

THe area would be ,

$\displaystyle

A=\frac{1}{2}\vert\begin {pmatrix} 1 & 6 & 9 & 3 & 1 \\ 3 & 5 & 1 & -3 & 3 \end {pmatrix}\vert

$

Gosh , i have a problem typing matrix . sorry if its a bit messy . Generally , if you are asked to find the areas of triangle or quadrilateral given their vertices, you can do that . DO you know how to get its determinant ? - Nov 30th 2009, 06:03 AMsharkman