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OpenStudy (anonymous):
the points A(2,3) B(4,-1) C(-1,2) are the vertices of a triangle. find the lenght and perpendicular from A to BC and hence the area of ABC
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OpenStudy (raden):
first, u have to determine the length all sides that triangle... AB = ... AC = ... BC = ... hint : use the formula AB=sqrt[(y2-y1)^2+(x2-x1)^2]
OpenStudy (anonymous):
AB= underrroot 20 BC= underrroot 34 CA= underrroot 10
OpenStudy (raden):
yes, correct... after that, can u determine the area of triangle ABC by sine rule formula : area = 1/2 * side * side * sin
OpenStudy (raden):
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