Posted by **Anonymous** 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 -
**bobpursley**, 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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