Limit of sin(x) = x (as x tends towards 0)

Lets consider these three shapes. 1. The large triangle QBA. Its base QA is 1 unit. The line AB can be found knowing that Tan(x) = AB/QA, but AQ is 1. Therefore AB = Tan(x) This means Area = half x base x height = 1/2 x 1 x tan(x) = 1/2 tan(x) 2. The area of the small triangle QPA can be found using the formula Area = 1/2 ab sinC. in this case both a and b are 1 since we are in the unit circle. this means Area = 1/2 sin(x) 3. The sector has area (in radians) of x/2π×πr^2

 

Peter Dennis

 
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Activity
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Target Group (Age)
15 – 18
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