A negative angle is an angle measured by rotating clockwise (instead of counterclockwise) from the positive x axis.

In geometry, a plane is a flat surface that extends forever in two dimensions, but has no thickness. In algebra, we graph points in the coordinate plane, which is an example of a geometric plane.

Point: Point refers to an exact location that is represented by a dot. Real-Life Examples: A location of a place in the Map. The tip of a needle.

Real-world examples of line segments are a pencil, a baseball bat, the cord to your cell phone charger, the edge of a table, etc. Think of a real-life quadrilateral, like a chessboard; it is made of four line segments.

A ray is a part of a line that has one endpoint and goes on infinitely in only one direction. You cannot measure the length of a ray. A ray is named using its endpoint first, and then any other point on the ray (for example, →BA ).

: an angle generated in a direction opposite to an arbitrarily chosen usually clockwise direction.

Going anti-clockwise means the angle increases. So if you go from −π to π, you go around the circle anti-clockwise, but you start on the left, not on the right, where the angle is 0. If you’re going from 0 to −π, then you’re going clockwise half around the circle.

If necessary, first “unwind” the angle: Keep subtracting 360 from it until it is lies between 0 and 360°. (For negative angles add 360 instead). Sketch the angle to see which quadrant it is in….Finding the reference angle.

Now the measure of the angle is -m, a negative value when measured clockwise is, because all angles have to be acute to apply the various trigonometrical ratios or relations. Hence, cosine of a negative angle changes into a positive value.

cos(-θ) = cos θ & sin(-θ) = – sin θ. These are the negative angle identities.