As featured in the video, students can use the books to practice using a protractor to measure angles. Students can also practice using a ruler to measure size, calculate area, and estimate proportions to real-life scale. Each printed book contains 30 pages with one diagram per page, including ample space for drawing, making calculations, and taking notes. The books range in difficulty from easy to difficult. Easy topics include ballet, yoga, and cars, which present simple angles without distraction. Advanced books, featuring more complicated angles, include Summer Olympics, Winter Olympics, Archery & Fencing, Gymnastics, Figure Skating, Water Sports, Architecture, Home Construction, and Gardens. These books can be integrated into elementary classes in math, art, and physical education. Additional Information