The previous post posted wrong................this is clearer.......the square root of 2.....starts....out ......1.414.......which is less than half of pi.........180 degrees.....on the 1/2 radius circle......the only one in the 1st half the of the circle........the value of the next square root is past half of pi.....numerically......the square root of 3 starts out......1.73..........two of the square roots of pf are past pi.........................so 7 of them are between 180 and 360 degrees..........there are 7 primes by taking the diff. of squares..............

(1 / 2) * pi = 

1.57079632679

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More info

Trigonometry Angles--Pi/2 -- from Wolfram MathWorld

mathworld.wolfram.com › Geometry › Trigonometry › Trigonometric Identities

by EW Weisstein - ‎2003 - ‎Cited by 4 - ‎Related articles

-coordinate of the point with polar coordinates (r,theta)=(1,pi/2) , giving sin(pi/2)= 1 . Similarly, cos(pi/2)=0 , since it is the x -coordinate of this point. Filling out the ...