Question

Can you help me with a problem

Answer 1

Given

Triangle ABC

with vertices A(-9,4), B(-4,5), C(-7,9)

find the Area

Procedure

`\begin{gathered} A=|(-9(5-9)+(-4)(9-4)+(-7)(4-5))/(2)| \\ A=|((-9)(-4)+(-4)(5)+(-7)(-1))/(2)| \\ A=|(36+(-20)+7)/(2)| \\ A=|(23)/(2)| \\ A=11.5 \end{gathered}`

The answer is: the area is 11.5 units^2