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C2 Official thread

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i am resitting C2 and all I find confusing is finding area using integration in some questions and graphs of trigonometry
 
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I have a question here, it's jan 2007 question no. 9 part c. I don't knw hw they got the exact value as 9 root 3. The formula is 0.5*36*sin (2pi/3), right? So hw did they get the exact value with the root? hw is the root brought here?
 
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I have a question here, it's jan 2007 question no. 9 part c. I don't knw hw they got the exact value as 9 root 3. The formula is 0.5*36*sin (2pi/3), right? So hw did they get the exact value with the root? hw is the root brought here?
Remember: Sin(2π/3) = Sin(π − π/3) = Sin(π/3) = √3/2
Area = (½) * a * b * SinC
Area = ½ * 6 * 6 * Sin(2π/3)
Area = 36/2 * √3/2
Area = (36√3)/4
Area = 9√3
 
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Hello people which surface area and volume should I learn??
N please let me know which formulaes should I learn!!
 
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