平行四边形在线计算器
1. 面积 = bh = absinθ 2. 周长 = 2a + 2b 3. 短对角线 = sqrt(a2 + b2 - 2abcos(θ)); 4. 长对角线 = sqrt(a2 + b2 - 2abcos(π - θ)); |
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Your Guide to Legal Angling Across America - US Fishing Licenses
Your Guide to Legal Angling Across America - US Fishing Licenses