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Civil Engineering Formulas RCC Formula 1. 𝑓 𝑚 = 𝑓 𝑐𝑘 + 1.65 𝜎  2. 𝐸 𝑐 = 5000 √𝑓 𝑐𝑘 and 𝑓 𝑐𝑟 = 0.7 √𝑓 𝑐𝑘   3. 𝜀 𝑠𝑡 = 0.002 + 0.87 𝑓 𝑦 /𝐸 𝑠   4. 𝐸 𝑠 = 2 × 10^5 𝑀𝑃𝑎 , 𝑚 = 280/ 3 𝜎 𝑐𝑏𝑐   5. ?…