exam Maths Puzzle Numerical Ability

Please explain how the equation of the radius of a circumscribing circle which is "'a' square root of three divided by 3" ,where 'a' is a side of the inscribed equilateral triangle

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Simplify

c-1 power + d -4 power (Add. Write the answer with all exponents positive)
The magnitude and direction of vectors u and v are given. Choose the correct magnitude:
u: magnitude 1,850, bearing 125o
v: magnitude 2,960, bearing 25o
W: u + 2v