Now check your work by using the GeoGebra geometry tool to repeat parts A through D. Open GeoGebra, and complete each step below. If you need help, follow these instructions for using GeoGebra. You will take a screenshot of your work when you are through, so be sure to clearly label your construction as you work. Plot points A, B, and C, and draw a polygon, ΔABC, through the points.
Draw a line perpendicular to through point B.
Label the intersection of the line perpendicular to through B and point D.
Measure and display the slopes of and .
Display the equations of and in the Algebra margin.
Measure and display the lengths of and .
Calculate and display the area of ΔABC.
Take a screenshot showing the geometric construction and the Algebra margin, save it, and insert the image in the space below.