0.720427*18
    0.720427*18*2*3.14
    7.467455965526542*10
    2*18*0.720427*sin(3.14/11)
    2*18*0.720427*sin(3.14*2/11)
    4*asin(4/(18*0.720427*2))
    62/101×101
    62/1101×101
    9/2-18
    2/9-18
    3×16+49
    62/111×101
    62/111×101
    1+2+7+8+9+14+15+16
    6+7+8+13+14+15+20+21+22-54
    11.2/13
    sqrt(6.6^2+11.2^2)
    sqrt(14^2-11.2^2)
    1+6+36
    9+8+7+6+5+4+3+2+1

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