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Maths Exercices
Trigonometric ratios: Cosine

Cosine: The cosine of an angle in a right triangle equals the adjacent side divided by the hypotenuse.

cos θ = adj
hyp
 

Find Cos A and Cos B  
Using the Pythagorean Theorem, the missing leg must be 15, then
Cos A = 15
17
      and   Cos B = 8
17
   

Look at the following right triangle, where:
a = 4
b = 9
Find the cosine of angle A

The cosine of angle A s =
(round the solution to hundredths)