GRE Exam Numerical Ability Area and Volume

A 5 by 3 rectangle is inscribed in circle. What is the circumference of the circle?

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GRE Other Question

Jaison's collection contains US, Russian and British stamps. If the ratio of US to Russian stamps is 5 to 3 and the ratio of Russian to British stamps is 5 to 1, what is the ratio of US to British stamps? Two sets of 4 consecutive positive integers have exactly one integer in common. The sum of the integers in the set with greater numbers is how much greater than the sum of the integers in the other set?