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The Sine Rule - used to find a missing ANGLE or LENGTH when we know a side and its
opposite angle
a = Sinb c
Sin A B = Sin C

Tip: You only need two of the ones above and if you want to find a length, put…

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l = r

Tip: If the ask for perimeter, just add up the two radius's and
arc length

Area of a Sector
1 2
A= 2 r


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