Q: What is 4 pi over nine radians on the unit circle?

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Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.

Looking at a unit circle, cosine is the horizontal coordinate. Pi radians is halfway around the circle (180Â°), so the coordinate is (-1,0). Cosine(pi) = -1

Within a circle, the units used for measurement are either in degrees or in radians. In addition, radius and diameter are used, which can be in any unit of length, are important dimensions from which size, area, and circumference are obtained.

The period of a trigonometric function, since it depends on the angle of a ray centered in a unit circle, is 2 pi radians or 360 degrees.

Yes, but only if the argument of the sine function is in radians.

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45 degrees are pi/4 radians. You can verify this with a unit circle.

The unit of measure used for angles and arcs is called degrees. A full circle is divided into 360 degrees. Alternatively, radians can also be used as a unit of measure, where a full circle is equivalent to 2π radians.

Two commonly used units are degrees and radians. With degrees, a full circle is divided into 360 degrees; when radians are used, the same full circle is equal to 2 x pi radians.

105 deg = 1.8326 radians approx. The radius of the circle has no effect on the measurement of angles.

A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17'44.6"

Radian is the unit for angular displacement is SI system of units.

Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.

That's a unit of angular measurements. 2 x pi = one full circle. If you want to convert radians to degrees, you multiply by (180 / pi).

Angular speed is typically measured in radians per second (rad/s). One radian is equal to the angle subtended at the center of a circle by an arc whose length is equal to the radius of the circle.

The radian system describes angles in terms of the diameter of a unit circle, i.e. where the radius is 1. If two lines intersect at the radius of a unit circle, the angle in radians between those two lines is the length of the arc along the diameter of the circle delimited by those two lines. The diameter of a unit circle is 2 pi. In the degree system, the angle of one quarter of the circle is 90, while the radians of that same angle is pi / 2. One radian is approximately 57.3 degrees.

Looking at a unit circle, cosine is the horizontal coordinate. Pi radians is halfway around the circle (180Â°), so the coordinate is (-1,0). Cosine(pi) = -1

Possibly the most familiar to many people is degrees, but this is not the only unit. Radians are a unit often easier to work with. A full circle = 360 degrees = 2pi radians. It could be argued radians are a more basic unit since they're based on the formula for circumference and not on dividing the circle into an arbitrary number of pieces - someone had to choose 360 rather than 400, 1000, or some other number for number of degrees in a circle. ... The 360 comes from the Babylonians, ca 1500BC. Their number system was based on 60 (6X60=360) - this is also the reason for 60 minutes in an hour and 60 seconds in a minute, in angles as well as time.