2nRsin(180°/n)n=4an59.5587R=C周長(zhǎng)=238.234830442.11440.707112、正多邊形周長(zhǎng)計(jì)算公式?已知內(nèi)切圓半徑R正n邊形的邊長(zhǎng)為an=2rcot(180°/n)所以周長(zhǎng)為c=2n2rcot(180°/n)2cot(180°/n)>n=4an81.3587r=C周長(zhǎng)=40.6794325.4351正多邊形周長(zhǎng)計(jì)算公式?已知邊長(zhǎng)an求外接圓半徑RR=an/2sin(180°/n)n=12an21.8R=42.11443.73205C周長(zhǎng)=261.6C周長(zhǎng)=261.60.25882正多邊形周長(zhǎng)計(jì)算公式?已知邊長(zhǎng)an求內(nèi)切圓半徑Rr=an/2*cot(180°/n)n=12an21.8r=40.6794萊垍頭條
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