Answers

2014-03-18T13:09:09+05:30
It  will be one fourth of the area of triangle abc
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2014-03-18T15:42:19+05:30
Area of triangle =  \frac{1}{2} [ x_{1} ( y_{2} - y_{3} )+ x_{2} ( y_{3} - y_{1} )+ x_{3} ( y_{1} - y_{2} )]
=1/2[1(2-4)+3(4-(-2)-1(-2-2)]
=1/2[1(-2)+3(4+2)-1(-4)]
=1/2(-2+3(6)+4)
=1/2(-2+18+4)
=1/2(-2+22)
=1/2(20)
=10
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