In the figure above, PQ is a diameter of cirde O, PR=SQ, and △RST is equilateral. If the length of PQ is 2, what is the length of RT?
1/2
1/~$\sqrt{3}$~
~$\sqrt{3}$~/2
2/~$\sqrt{3}$~
~$\sqrt{3}$~
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(1) 30度和60度, 是1:√3:2
(2) 45度的,是1:1:√2
问题变为 已知等边三角形高为1,边长是多少?