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Standard position & reference Angles chathamtownfc.net Topical overview | Algebra 2 rundown | MathBits" Teacher resources Terms the Use call Person: Donna Roberts
The section Unit Circle verified the location of degrees and also radians in the coordinate plane. Angle in the unit circle begin on the x-axis and are measure counterclockwise around the origin. While these unit circle ideas are tho in play, we will now not it is in "drawing" the unit circle in every diagram. Our diagrams will now permit us to job-related with radii exceeding the unit one (as checked out in the unit circle).

You are watching: When the terminal side of an angle in standard position lies along one of the axes, it is called


Standard Position:  An angle is in standard place if its vertex is located at the origin and also one beam is on the optimistic x-axis. The beam on the x-axis is dubbed the early side and the other ray is referred to as the terminal side. If the terminal next of an edge lies "on" the axes (such together 0º, 90º, 180º, 270º, 360º ), it is called a quadrantal angle. The angle displayed at the right is referred to as a Quadrant II angle because its terminal next lies in Quadrant II.
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The edge is measure up by the amount of rotation from the initial side to the terminal side. If measure up in a counterclockwise direction the measure is positive.  If measure up in a clockwise direction the measurement is negative.  (A negative associated with an angle"s measure refers to its "direction" the measurement, clockwise.)

If two angles in typical position have actually the very same terminal side, lock are referred to as coterminal angles. In the diagram at the left, +120º and also -240º space coterminal angles.


Reference Angles: connected with every angle drawn in standard position (except quadrantal angles) there is one more angle called the recommendation angle.  The referral angle is the acute angle (the smallest angle) created by the terminal side of the given angle and the x-axis.  recommendation angles may appear in all 4 quadrants. Angle in quadrant I space their own reference angles.

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A recommendation angle is always positive and is constantly less than 90º.

Remember:  The recommendation angle is measured native the terminal side of the original angle "to" the x-axis (not "to" the y-axis).

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If the starting angle is greater than 360º, begin by individually 360º native the beginning angle (as many times together needed) to come at a new "starting" angle the lies between 0º and 360º. (If working in radians, subtract 2π till the starting angle is between 0 and 2π radians.) Example: beginning angle 460º i do not care 460 - 360 = 100º beginning angle.


Topical synopsis | Algebra 2 outline | chathamtownfc.net | MathBits" Teacher resources Terms that Use contact Person: Donna Roberts