SQR(998)+6/4=33.091^2=1095------对照下SQUARE OF NINE是否对应998 45度角.
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improved Daniel formula:
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ring#=round((sqrt(998)-0.22/2),2)/2+0.5=16
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315_degree=(16*2+1)^2)=1089( O5 t3 A4 ~ `7 s- F' f
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In sq9 998 at 56 degree
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- L, S6 ?% z: r# Q3 T1089-360*3-56=47 degree |