Coordinate Geometry Level 5 Vol. 1 – This free geometry lesson is a must-see! Children join Raleigh in an effort to put together the pieces of the narthex stone and uncover the lost temple. In order to find each piece, students must locate and plot ordered pairs and use the origin of a coordinate plane as a point of reference. Exciting interaction, cool characters, and specific feedback make this lesson a favorite amongst parents and students.