Wallace-Simson Lines of Antipodal Points
Take any point P on the circumcircle and its antipodal point. Their Simson lines intersect at right angles on the nine-point circle.
π = 4 ?
Paradoxes on π
Open Middle: Graphing Linear Inequalities (1)
Open Middle: Graphing Linear Inequalities (4)
Open Middle Cyclic Quadrilateral Exercise
Shape of graph as 'a' changes
Areas of shapes
All Radii =