# How to find the missing angle of a triangle using trig when you only know 1?

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A circle has the equation x2 + y2 – x + 10y + 13 = 0. What is the radius of this circle? ...

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Solve 4(−x + 4) = 12, justifying each step with an algebraic property. ...

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aoseraIf you have 2 KNOWN sides & 1 Angle ; Use Cosine Rule If you have 3 KNOWN sides, Also Cosine Rule If you have 2 KNOWN angles & 1 side, Use SINE rule If it's a right-angled triangle, use SOH CAH TOA Hopefully this helps