Learning goals: Teacher Facing Understand that the measure of a full rotation of a ray at a fixed point is 360 degrees. Use benchmark angle measurementes (such as $90^\circ$, $180^\circ$, $270^\circ$, $360^\circ$) to reason about and estimate the size of angles in degrees. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 4.7 Angles and Angle Measurement, Grade 4.