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when bearing is greater than 180 In order to calculate back bearing subtract bearing from 360
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
The perimater of a circle is the same as the circumference of a circle, but if it's only a half of a circle (semi-circle) you would use the formula 2*pi*r/2 If it's a quarter of a whole circle, or a fifth of a circle, then you would divide it by 4 or 5.
To calculate the area of a circle use this formula: pi x r2.
A whole circle