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The Sine Rule

C. 100km. 50 0. 60 0. A. B. The Sine Rule. Find the length of CB. D. None of the trigonometric rules we currently know will help us here. We will split triangle ABC into two right angled triangles by adding an altitude CD. C. C. b. 100km. h. 50 0. 60 0. A. D. A. B. D. C. h.

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The Sine Rule

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  1. C 100km 500 600 A B The Sine Rule Find the length of CB D None of the trigonometric rules we currently know will help us here. We will split triangle ABC into two right angled triangles by adding an altitude CD.

  2. C C b 100km h 500 600 A D A B D C h D B In the same way;

  3. C 100km 500 600 A B Find the length of CB  ? Using the sine rule;  

  4. b) In triangle RST calculate ST. R  ? Using the sine rule; 15cm   300 1100 S T

  5. Page 126 Exercise 1

  6. A 9cm 1200 B C 3cm Calculating An Angle Calculate ABC and  BAC.   Using the sine rule; 

  7. Page 127 Exercise 2 Page 128 Exercise 3B

  8. B h A C b Area of a Triangle h Which is normally written:

  9. C 3 6 B A Calculate the area of triangle ABC where all lengths are given in cm.

  10. Page 135 Exercise 7

  11. Which Formula?            

  12. Page 137 Exercise 8A Page 138 Exercise 8B followed by the check up on page 139

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