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Use cosine ratio to calculate angles and sides (Cos = ah \frac{a}{h} )

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Intros
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Lessons
  1. What are sine, cosine and tangent?
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Examples
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Lessons
  1. Determine each cosine ratio using a calculator
    1. cos⁡50∘\cos 50^\circ
    2. cos⁡−50∘\cos-50^\circ
  2. Determine the angle to the nearest degree using a calculator
    1. cos⁡θ=0.24\cos \theta = 0.24
    2. cos⁡θ=−0.45 \cos \theta = -0.45
  3. Determine the angles and sides using cosine
    1. Find angle A and B:

      Use cosine ratio to calculate angle
    2. Find the value of "x" using cosine

      Use cosine ratio, adjacent side and cosine theta to find hypotenuse
    3. Find the value of " θ\theta " using cosine
      Use cosine ratio, adjacent and hypotenuse length to calculate cosine theta
  4. Draw and label a right triangle to illustrate Cosine ratio, then calculate the angle.
    1. cos⁡θ=817\cos \theta ={8 \over 17}