Explore unit circle quadrants. Learn to memorize the unit circle and convert degrees to radians, learn the unit circle trick, and find the ratios...
So, what is a reference angle? A reference angle is the measure of the smallest positive, central angle whose rays are the terminal side and the x-axis. The reference angle on the unit circle can be measured in either degrees or radians....
a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius. 360° 2π radians or 6.28 radians 60° 1 radian Degrees to Radian Radians to Degrees Arc Length Area of a sector Circumference ...
The unit circle is simply a circle with a radius of 1. In trigonometry, the unit circle also has reference angles with the cosine and sine answers for each angle. To use the unit circle, we find our angle in either the degrees unit circle or the radians unit circle. Once we have ...