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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9 u/ q/ Z2 j+ ~5 _9 }3 [/ @improved Daniel formula:5 e2 Y7 E' F& _+ C5 X3 N
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6 b- T; T. I6 p- f& u- |, ~ring#=round((sqrt(998)-0.22/2),2)/2+0.5=16
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2 Z- d, k* v1 a315_degree=(16*2+1)^2)=1089
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4 R, k* q' x! l3 `/ M8 u' MIn sq9 998 at 56 degree 7 H& ]* J# v c, ^
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1089-360*3-56=47 degree |