Angles and Their Measure

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Presentation transcript:

Angles and Their Measure Section 7.1 Angles and Their Measure

OBJECTIVE 1

Radians

OBJECTIVE 2

Find the length of the arc of a circle of radius 4 meters subtended by a central angle of 0.5 radian.

OBJECTIVE 3

(a) 80° (b) 140° (c) -30° (d) 100°

OBJECTIVE 4

Find the area of the sector of a circle of radius 5 feet formed by an angle of 40°. Round the answer to two decimal places.

OBJECTIVE 5

Linear Speed Angular Speed

Earth rotates on an axis through its poles Earth rotates on an axis through its poles. The distance from the axis to a location on Earth 40° north latitude is about 3033.5 miles. Therefore, a location on Earth at 40° north latitude is spinning on a circle of radius 3033.5 miles. Compute the linear speed on the surface of Earth at 40° north latitude.