Step-by-step explanation:
With reference angle beta
perpendicular (p) = 5
base (b) = 8
hypotenuse (h ) = ?
By using Pythagoras theorem
h² = p² + b²
h² = 5² + 8²
h² = 25 + 64
h² = 89
therefore h = 9.43
Now Cos beta = b/h
= 8/9.43
