Lesson Plan

Define a radian as the measure of an angle whose arc length on the unit circle equals the radius

Explain why a full rotation equals 2pi radians by relating circumference to radius

Convert between degree and radian measures using the relationship 180 degrees = pi radians

Identify radian measures of key angles: pi/6, pi/4, pi/3, pi/2, pi, and 2pi

Justify why radians are a natural unit of angle measure for mathematics

Label angles in standard position on the unit circle using radian measure

HSF.TF.A.1

HSF.TF.A.1: Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.