Do you mean
Sin(pi/7) or {Sin(pi)} / 7
Note the position of the '7' be it inside or outside the Sine Function.
Clarity is needed, in the position of the '7'.
However,
Maker sure you calculator is in 'Radian' mode.
Sin(pi/7) =
Sin(0.44879895...)
=0.0078329....
or
{Sin(pi)}/7 = 0.054803665.../7
= 0.007829095021....
Note the two different answers.
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you dont
Calculate the percentage that a particular sector represents of the total value. Then the angle size is 3.6 times the percentage.
use an angle finder
182 metres is 597.112861 feet
You can calculate the sine function on any scientific calculator, including the one included in Windows or other computers. Just make sure you select the correct type of angle measurement - degrees or radians, depending which you want to calculate.