A planet rotates on an axis through its poles and 1 revolution takes 1 day​ (1 day is 18 hours). The distance from the axis to a location on the planet 30° north latitude is about 3995.5 miles.​ Therefore, a location on the planet at 30° north latitude is spinning on a circle of radius 3995.5 miles.

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Chapter5: Trigonometric Functions: Right Triangle Approach
Section5.1: Angle Measure
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A planet rotates on an axis through its poles and 1 revolution takes 1 day​ (1 day is 18 hours). The distance from the axis to a location on the planet 30° north latitude is about 3995.5 miles.​ Therefore, a location on the planet at 30° north latitude is spinning on a circle of radius 3995.5 miles. Compute the linear speed on the surface of the planet at 30° north latitude. The linear speed on the surface of the planet is nothing miles/hour.

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