exam Maths Puzzle Numerical Ability

In a circle whose radius is 15 inches, a chord is 12 inches from the center, what is the length of the chord

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exam Other Question

If f(x)={(3,5), (2,4), (1,7)} and h(x)= {(3,2), (4,3), (1,6)} then what is f(h(4))? What is the formula for turning a decimal into a fraction? Example : .64 2/3 turn that into a fraction. Thanks in advance for your help!