108.75*56.25*(180-2*arccos0.8+2*0.8*sqrt (1-0.8^2))
    （45981-41361）/45981
    （34811-31265）/31265
    （34811-31265）/34811
    （87*45*3.14-87*45*（360-4*arcsin0.71））/((90-0.71)*0.71*(2*87+6)*(2*45+6))
    87*45*（3.14-4*arcsin0.697353+360）/((90-0.697353)*0.697353*(2*87+6)*(2*45+6))
    (3.14*87*45-87*45*（4*arcsin0.697353-360）)/((90-0.697353)*0.697353
    87*45*（4*arcsin0.697353+3.14-360）/((90-0.697353)*0.697353*(2*87+6)*(2*45+6))
    87*45*（4*arcsin0.697353+3.14-180）/((90-0.697353)*0.697353
    arcsin0.697353
    87*45*（4*arcsin0.697353+3.14-180）/((90-0.697353)*0.697353*(2*87+6)*(2*45+6))
    (90-(sqrt2)/2)*(sqrt2)/2*(2*87+6)*(2*45+6)
    arcsin((sqrt2)/2)
    87*45*（4*45.000018-180）
    87*45*（4*45.000018-180）/((90-(sqrt2)/2)*(sqrt2)/2*(2*87+6)*(2*45+6))
    87*45*（4*45-180）/((90-sqrt2/2)*sqrt2/2*(2*87+6)*(2*45+6))
    87*45*（4*0.79-180）/((90-sqrt2/2)*sqrt2/2*(2*87+6)*(2*45+6))
    arcsin(sqrt2/2)
    87*45*（4*arcsin(sqrt2/2)-180）/((90-sqrt2/2)*sqrt2/2*(2*87+6)*(2*45+6))
    sin0.93

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