In order to derive the formula to calculate the angle at the centre of the sector, the formulae for the arc length and area of a sector can be rearranged so that we can calculate the fraction of ...
To calculate the length of the arc, we need to know what fraction of the circle is shown. To do this, we use the angle and compare it with 360Ëš. This angle is 144°. That is \(\frac{{144^\circ ...
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