Polygons: Convex vs. Concave
According to the 2nd applet, how would you describe what it means for a polygon to be convex? How would you describe what it means for a polygon to be concave?
Take another look at the 1st applet. Place BOTH the endpoints of the adjustable line segment somewhere on the boundary of a variety of different shapes. How might you define the terms convex and concave with respect to this line segment?
Is it ever possible for a triangle to be concave? Why or why not?