Answer to Question #160324 in Analytic Geometry for Viktoriya

Question #160324

find the area of a triangle with vertices E(1,3) F(-4,-3) G(5,-4)


1
Expert's answer
2021-02-02T06:20:55-0500

Require to find the area of the triangle: E(1,3),F(4,3),G(5,4)E(1,3),F(-4,-3),G(5,-4)

Let (x1,y1)=(1,3),(x2,y2)=(4,3),(x3,y3)=(5,4)(x_{1},y_{1})=(1,3),(x_{2},y_{2})=(-4,-3),(x_{3},y_{3})=(5,-4)

Area of the triangle EFGEFG =12[x1(y2y3)+x2(y3y1)+x3(y1y2)]=\frac{1}{2}\left [ x_{1}(y_{2}-y_{3})+x_{2}(y_{3}-y_{1})+x_{3}(y_{1}-y_{2}) \right ]

=12[1(3+4)4(43)+5(3+3)]=\frac{1}{2}\left [ 1(-3+4)-4(-4-3)+5(3+3) \right ]

=12[1+28+30]=592=\frac{1}{2}\left [ 1+28+30 \right ] =\frac{59}{2} square units


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