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Find the perpendicular distance of the point bar(c ) from the straight line bar(r )= bar(a) + t bar(b) and hence deduce that the area of the triangle whose vertices are the points bar(a), bar(b) and bar(c )" is" (1)/(2)|bar(b) xx bar(c ) + bar( c) xx bar(a) + bar(a) xx bar(b)|. |
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