book Maths Puzzle Numerical Ability

well my problem is...i dont even know where to start when doing these word problems...im easily confused when it comes to these types of problems...what can i do?

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What is the degree of an angle whose cosine is .86 Dear Sir/Madam,

I am having difficulty finding the equation to the following problem.

The center of a circle is (1,2). A line touches the circle at a point (1,4). The line is tangent to a circle at that point. Find the equation of the line.