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Posted by on Saturday, January 24, 2009 at 9:07pm.

A(-11,8)B(2,-6) and C(-19,-8) are the vertices of Triangle ABC. N(X,Y) is a point on AC such the BN is Perpendicular to AC. Find Area of Triangle ABC. PLEASE HELP!!!

  • Math - , Saturday, January 24, 2009 at 9:44pm

    The second sentence is not needed.

    Draw the triangle. Compute the side lengths

    s1=AB= sqrt ((bx-ax)^2+(by-ay)^2 )
    = sqrt ( 13^2 + (-14)^2 )= sqrt (169+256)=20.6

    and do that for all sides. Then knowing the sides, calculate the perimeter, divide by 2. Let that be p.

    Area=sqrt (p(p-a)(p-b)(p-c))

    Or you can do it here
    http://www.analyzemath.com/Geometry_calculators/perimeter_area_tri_verti.html

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