How to find area of triangle ABR in this?
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area of triangle = 1/2[x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)]
where x1,x2,x3 are the x coordinates and y1,y2,y3 are the y coordinates
where x1,x2,x3 are the x coordinates and y1,y2,y3 are the y coordinates
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