Question

To find the terminal point of pi/3 on a circle with a radius of 3, do I just multiply the point (1/2, sqrt3/2) by 3?

Answer 1

yep :)

Answer 2

Thanks! So the answer would then be (3/2, 3sqrt3/2)?

Answer 3

yes

Answer 4

Thanks. Another question... Why is the cos(5pi/6) not equal to -3/sqrt2? wrong quadrant?

Answer 5

you got yer square root in the wrong place

Answer 6

http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

Answer 7

Duh! Thanks. I swear I'm dyslexic. I'm looking at the unit circle and still couldn't see why I got that one wrong on my test.

Answer 8

no matter how far I get in math, a little dyslexia in the algebra creeps in from time to time and drives me mad. That's just part of the deal :P

Answer 9

logically though, you should know that cos(x)=-3/sqrt2 is impossible, because |-3/sqrt2|>1, which means it is not on the unit circle