半徑R=995,玄長(zhǎng)L=1390,求弧長(zhǎng)C?
弧所對(duì)的圓心角為A.
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((1390/2)/995)
=88.61度
C=PI*R*A/180=PI*995*88.61/180=1538.84
知道玄長(zhǎng)和半徑 如何求弧長(zhǎng)!急
知道玄長(zhǎng)和半徑 如何求弧長(zhǎng)!急
半徑995,玄長(zhǎng)1390,求弧長(zhǎng),
半徑995,玄長(zhǎng)1390,求弧長(zhǎng),
數(shù)學(xué)人氣：490 ℃時(shí)間：2020-05-05 21:27:04
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