Explore relativistic velocity, core circles, and Paul Miller's protractor in this 39-minute mathematics lecture. Learn how to use the core circle to efficiently measure spreads and projective quadrances between lines. Discover the projective Triple quad formula and its affine counterpart, the Triple spread formula, as alternatives to traditional trigonometric angle calculations. Gain insights into a more rational and powerful approach to geometry that moves beyond conventional mathematical notation. Delve into the connections between projective and affine measurements, enhancing your understanding of geometric relationships.