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Sine or Cos Rule?

Sine or Cos Rule?. 15cm. 1. ?. 12cm. 30 o. a 2 = b 2 + c 2 – 2bcCos A. Cos A = b 2 + c 2 – a 2. 2bc. a b c . =. =. sinA sinB SinC. 15cm. 2. 30 o. ?. 14cm. a 2 = b 2 + c 2 – 2bcCos A. Cos A = b 2 + c 2 – a 2. 2bc. a b c . =. =.

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Sine or Cos Rule?

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  1. Sine or Cos Rule?

  2. 15cm 1. ? 12cm 30o a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  3. 15cm 2. 30o ? 14cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  4. ? 3. 50o 600 15cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  5. 4. 12cm ? 14cm 15cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  6. 15cm 5. 30o area? 14cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  7. 15cm 1. ? 12cm 30o a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2  need 3 sides! 2bc a b c = = sinA sinB SinC

  8. 15cm 2. 30o ? 14cm a2 = b2 + c2 – 2bcCos A need 2 sides and angle Cos A = b2 + c2 – a2  2bc a b c = = sinA sinB SinC

  9. ? 3. 50o 600 15cm a2 = b2 + c2 – 2bcCos A need 2 sides and an angle  Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

  10. 4. 12cm ? 14cm 15cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc need 3 sides!  a b c = = sinA sinB SinC

  11. 15cm 5. 30o area? area = ½ ab sinC 14cm a2 = b2 + c2 – 2bcCos A Cos A = b2 + c2 – a2 2bc a b c = = sinA sinB SinC

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