👉 Learn how to evaluate the cosine of an angle in radians using the sum/difference formulas. To do this, we first express the given angle as a sum or a difference of two (easy to evaluate) angles, ...

👉 Learn how to solve for an unknown variable in the exterior angle of a polygon. The exterior angle of a polygon is the angle between a side of the polygon and an outward extension of the adjacent ...

Teachers can use these questions to draw students out and get worthwhile formative assessment responses to guide instruction.

Debates over how geometry is understood and learned date back at least to the days of Plato, with more recent scholars ...