Week 12 – Pre Calculus 11 – Special Triangles Jan16 by Jacob This week in Pre-Calculus 11 we learned about special triangles. There are 2 types of special triangles. One with the angles of 45, 45, and 90 ad another with the angles 30, 60, 90. For triangle 1 the ratios are The ratios for triangle 2 are: