trigonometry

trigonometry

1. SINE

   • opposite/hypothenuse

2. COSINE

   • adjacent/hypothenuse

3. TANGENT

   • opposite/adjacent

4. RIGHT ANGLED TRIANGLES

5. FINDING THE ANGLE

6. EG To find COS A it's = adjacent/hypotenuse. Then we have COS-1 by the adj/hyp = A. Solve to find angle A.

7. NON-RIGHT ANGLED TRIANGLES

   • To find the area of a non-right angled triangle the formula is 12bcSINA OR 1/2abSINC or 1/2acSINB

8. SINE RULE

   • a/SINA = b/SINB = c/SINC

9. COSINE RULE

   • a^2 = b^2 + c^2 - 2bcCOSA