Section 4.1: Angles and Their Measures

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Presentation transcript:

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?

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

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

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.

Solve applications.