Draw a quadrilateral in the Cartesian pl...

Draw a quadrilateral in the Cartesian plane, whose vertices are `(-4, 5) , (0, 7) , (5, -5) " and " (-4, -2) `. Also , find its area.

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The correct Answer is:

`(121)/2` square unit.

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The area of triangle whose vertices are (1,2,3), (2,5,-1) and (-1,1,2) is

A

150 sq. units

B

145 sq. units

C

`sqrt155/2` sq. units

D

`155/2` sq.units

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