find the area of triangle whose vertices are (4,7)(1,3)(5,1)
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Formula for triangle when vertices are given is
1/2|x1(y1-y2)+x2(y2-y3)+x3(y3-y1)|
=1/2|4(3-1)+1(1-7)+5(7-3)|
=1/2|4*2+1(-6)+5(4)|
=1/2|8-6+20|
=1/2|22|
=11
1/2|x1(y1-y2)+x2(y2-y3)+x3(y3-y1)|
=1/2|4(3-1)+1(1-7)+5(7-3)|
=1/2|4*2+1(-6)+5(4)|
=1/2|8-6+20|
=1/2|22|
=11
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