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一個圓弧 弦長L=1690 弦高H=405 這個圓的半徑R是多少? R^2=(R-H)^2+(L/2)^2 R^2=R^2-2*R*H+H^2+L^2/4 2*R*H=H^2+L^2/4 R=H/2+L^2/(8*H) =405/2+1690^2/(8*405) =1084.012
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