1. Section 4.1: Angles and Their Measures
Do Now
How many degrees are in a circle?
How many degrees are in a semi-circle?
What is the measure of a right angle?
What is the area of a circle?
How can you determine the amount of area in a right angle of a circle with radius of 6 in?

2. Convert between DMS and degree form.
DMS: Degrees, Minutes, Seconds
Convert to simply degrees.
Convert to DMS.

3. Convert between degrees and radians.
Radians are another way to measure angles.
One radian equals ____________.
Pi radians equals _____________.
Two pi radians equals _____________.
Conversions…

5. Practicing Conversions
Convert to radians.
Convert to radians.
Convert to degrees.
Convert to degrees.

6. Use the arc length formula.
Given the radius is 10 inches and angle measure is , find the arc length. Given the angle measure is and arc length is 30 feet, find the radius. Given the arc length is 3½ yards and the radius is ¾ of a foot, find the angle measure in degrees.

8. Solve applications.