Lesson

3.1 RADIAN MEASURE




After completing this section, you should be able to:

  • convert between radian and degree angle measurement: \( 180^{\circ} = \pi \)
  • find arc length and sector area: \( \ell=r \theta, A=\displaystyle \dfrac{1}{2}r^2 \theta \)
  • find trigonometric ratios using unit circle
  • find trigonometric ratios using unit circle in four quadrants
  • find angles with particular trigonometric ratios
  • find exact ratios in radian
  • find the gradient of lines in radian measure: \( m = \tan \theta \)