The paper deduces the calculation formula of parallel sidelines of spiral curve, and proves two characters of parallels sidelines. It can be applied to instruct actual setting-out work.
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百科
弧长计算公式
弧长公式:n是圆心角度数,r是半径,l是圆心角弧长。 l = n(圆心角)x π(圆周率)x r(半径)/180