已知半径426米,弧高8米,求弧长多少米?

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已知半径426米,弧高8米,求弧长多少米?
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已知半径426米,弧高8米,求弧长多少米?
已知半径426米,弧高8米,求弧长多少米?

已知半径426米,弧高8米,求弧长多少米?
cosα=(426-8)÷426=0.98122065727699530516431924882629
α=11.1214°
2α=22.2418°
弧长:2πR×α÷360=2×3.1415926×426×22.2418÷360=165.370452016≈=165.37米

弧长为2×arccos(418/426)×426=165.3776383米