Since the Philippine K-12 reform in 2012, textbooks now follow a Spiral Progression Approach (SPA) across grade levels. This content analysis investigated the manifestations of the 3 features of a spiral curriculum: (1) revisit of topics, (2) increase in difficulty level, and (3) relating to pre-requisite knowledge, in math textbooks. Combining frameworks, the study analysed the discussions, examples, and exercises of the geometry chapters of 4 textbooks (1 series for junior high school). It was found that topic discussions were more repetitive than spiralling. Majority of the examples and exercises were also focused on low difficulty levels, thus leading to underdeveloped competency. The study reinforces the integral role of textbooks and crafting resources with the SPA features in mind to help in the implementation of the K-12 curriculum.