TRIGONOMETRY

TRIGONOMETRY

1. 1.Trigonometric ratios of an acute angle

   • sin&= BC/AB
   • cos&= AC/AB
   • tan&=BC/AC

2. 2.Basic trigonometric identifies

   • (sin&)*2 + (cos&)*2 =1
   • sin&/cos&=tan&

3. 3.Using a calculator in trigonometry

   • Entering an angle. key
   • Canculating a trigonometric ratio. keys
   • Inverse functions

4. 4.Solving right-angled triangles

   • Two sides known:
     • The third side is found using Pythagora´s theorem
       • Each of the acute angles is found based on the trigonometric ratio that relates it to the two known sides
   • A side and angle known:
     • Another side is found by using the trigometric retio that relates it to the known side of the angle
       • The other acute angle is complementary to the one we know

5. 5. Solving oblique triangles

   • Any non-right-angled triangle can be solved using the altitude strategy. This consist of choosing one of the altitudes of the triangle that gives you two right-angled triangles that can be solved separately or together.

6. 6.Trigonometric ratios of 0`and 360`

   • Sine
     • ++
       • --
   • Consine
     • -+
       • -+
   • Tangent
     • -+
       • +-

7. Metacognic Questions

   • What I`ve learnd?
     • I have learnd how to find Trigometric ratios, mesure them, basic trigonometrics identifies, use a calculator with this problems, solving right and oblique triangles problems.
       • What dificulties I had?
         • I had problems trying to learn and remember the rules of the ecuations and I will solve them doing more and more problems with them.