Leonardo da Vinci (1452-1519) is credited with being the first to perform quantitative experiments on friction, though his results were not known until centuries later, due in part to the secret code (mirror writing) he used in his notebooks. Leonardo would place a block of wood on an inclined plane and calculate the angle at which the block begins to slide. Here ports that the coefficient of static friction was 0.27 his experiments. Find at what angle did Leonardo blocks begin to slide?