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A quadrilateral has four points A(0,1), B(1,-3), C(5,-2) and D(4,0) as coordinates  What is the area of quadrilateral ABCD?

 Jul 30, 2021
 #1
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Here is one way (see image below)

calculate the entire area of the large red rectangle

   then subtract the areas of the right triangles 1 2 3 4   and the square 5   for your answer

 

 Jul 30, 2021

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