math

catherine11

148) right triangle OAB, O is (0,0), B (x, 0) and A (x,y), 角AOB=30度, OA长为１(* No use of this condition, may be let some stupid guy to calculate the number of x and y ???), ask y/x
作者答案及思路：ANS: 3^(1/2)/3
remeo评价意见：就是根号3/3。

my answer is 根号3/4， 请解释 一下好么？

sfish

The right angle is ABO, so the AB(y)=1/2, OB(x)=根号3/2
y/x=1/根号3--->根号3/3