I need help with trigonometric functions?

I can't remember trig functions but I can help you with the last question. I'm going to ume the length of the circular path (cirference) is 6 cm and that is not the radius or diameter of the path. Speed (not P)=distance/time. To get the speed in cm/minute you know the distance P travels is 3 revolutions so distance is 3x6 or 18 cm and it does it in 1 minute so speed =18/1 or 18 cm per minute. But you want to know the speed in cm/ second. Since there are 60 seconds per minute, divide 18 by 60 and you get the speed of .3 cm per second. Now you want to know how far it goes in 10 seconds so multiply that speed by 10 and you find it goes 3 cm in 10 seconds. (The secret is to keep the units-minutes, seconds, hours cm, m, etc straight.)