exam Maths Puzzle Numerical Ability

how can you represent the cosine of an angle in terms of a ratio?

thnx

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exam Other Question

I need help with the following pleas :

Find the quotient

5cd divided by 10c divided by d The bottom of a 13-foot long ladder is placed 5 feet away from a wall so that the ladder rests against the top. Assuming the wall is perpendicular to the ground, what is the height of the wall?