In the February 1954 issue of *Mathematics Teacher,* Paul C. Clifford describes an optimization problem from his trigonometry class. Of all isosceles triangles *ABC* with sides *AB* and *BC* of length 12, which one has the maximal area? Clifford told his class that an exact solution to the question required calculus. One student, … Continue Reading ››

# Tag Archives: triangle

# A Follow-Up to the Interior Angle Sum

This post is a follow-up to Sarah Stephens' guest post of a week ago, in which she described a lesson using embodied cognition to help students make sense of the interior angle sum theorem for triangles, not just as an abstract concept, but as a property grounded in their concrete physical experiences.