Find the area of triangle whose vertices vertices are (1 , 1) (1 ,2) and (4 , 5).....
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1/2|1(2-5)+1(5-1)+4(1-2)|
1/2|1(-3)+1(4)+4(-1)|
1/2|-3+4-4|
1/2(-3)
-3/2 unit..
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