Respuesta :
Carla is on the right track because she is finding the slopes of consecutive sides to check for right angles.
Slope
The slope of a line is the ratio of the vertical rise to the horizontal run. It is given by:
[tex]Slope=\frac{y_2-y_1}{x_2-x_1}[/tex]
[tex]Slope\ of\ CD=\frac{y_2-y_1}{x_2-x_1} =\frac{2-3}{1-2}=1\\ \\Slope\ of\ DE=\frac{y_2-y_1}{x_2-x_1} =\frac{1-2}{4-1}=-\frac{1}{3} \\\\Slope\ of\ EF=\frac{y_2-y_1}{x_2-x_1} =\frac{3-1}{5-4}=2 \\[/tex]
Carla is on the right track because she is finding the slopes of consecutive sides to check for right angles.
Find out more on slope at: https://brainly.com/question/3493733