Circle = 50 = 2Pi

The Unit Circle, the basis of Trigonometry, is a circle with a Radius of one.

Radius = r = 1

The Diameter of any circle is 2 times Radius. Hence, the Diameter of the unit circle is 2 x r = 2 x 1 = 2.

The Circumference of any circle is Pi times Diameter. Hence, the Circumference of the unit circle is Pi x 2.

The Word Addition of Pi is 25. P + I = 25. Hence, the Circumference of the Unit Circle is Pi x 2 = 25 x 2 = 50.

Interestingly, the Word Addition of Circle is 50. C+I+R+C+L+E = 50.

Hence, in Word Addition, just as in Trigonometry, the Unit Circle is defined by its Circumference.

2 x Pi = Circle