applied 40s may 21, 2009
DESCRIPTION
Introduction to periodic functions. Measuring angles with radians. Converting degrees and radians.TRANSCRIPT
Periodic Functions
Why are there 360° in a circle?What is the most "natural" way to measure
angles?
Circles by flickr user tydan
How do we convert between radians and degrees?
D is an angle in degreesR is an angle in radians
Find 30° in radians ... Find 20° in radians ...Examples:
θ is called "theta"
Find 250° in radians ... Find in degrees ...
Find -18° in radians ... Find in degrees ...
Find in degrees ...
COTERMINAL ANGLES
What does periodic mean?
Clock photo source
Convert the following to radian. Write your answers using π and in decimal form to two decimal places.
105° -11° 450°
HOMEWORK
Convert the following to degrees. Write your answers rounded to the nearest degree.
7π 6
3.52 -2HOMEWORK