1.  Find the length of an arc in a circle of radius 10 centimeters subtended by the central angle of 50°. Show your work.

 

2.  Graph  on [-4π, 4π] and verbalize how the graph varies from the graphs of . 

Graph   on the window [−5π, 5π] and describe freely what the graph shows. You can use www.desmos.com/calculator to obtain the graphs.
 

 

3. A 23-ft ladder leans against a building so that the angle between the ground and the ladder is 80°. How high does the ladder reach up the side of the building? Show the steps of your reasoning.