+Hurol Aslan thanks you for pointing out this relevant detail. No-one else here knows enough math to understand that the joke doesn't quite work. Maybe if they knew some latin they could make a joke involving the word "sinus" as well...
+Ravikiran B A it is not a fail, it is just not very well presented, easier to see here : : "What is your SINE it must be pi/2 because you are the 1". The gag is the use of Sine not Sign, but because it is on a different line it is not easy to see (well for me at least) ;)
Seriously? To the people dissecting every last element of the joke please follow this easy two step process: 1. Develop sense of humour 2. Read the joke again Repeat the above until you lighten up and crack a smile.
The tangent of 90 is infinite btw..... And you don't have to understand pick up lines for them to work.. If you want to test her,say pie instead of half pi... Cause I believe the sine of pi is 0... So let's see if she's smart or just wants to look like it. 8 D(if what I said is true)
This is a reference to sex. Pi/2 or 90 degrees meaning the girl is sitting on top while "the 1" is the guy's erected boner. And yes, 90 degrees is related to 1 and "you are the 1" is clearly a sympathy, but when mixed with each other in a semi-nonsense way (all these posts about arcsin LOL) they definitely mean you don't actually need a deep understanding of math to get the joke. Enjoy.
Best Answer by mramahmedmram - Chosen by Voters in the unit circle ( r=1) if a point on the circle in the first quadrant (x,y) then the sine of the angle at the center = oppsite /hypotenuse = y/1 =y when the cordinates are (0 ,1 ) then the angle is pi/2 then sin pi/2 = 1/1 = 1 q.e.d