book Maths Puzzle Numerical Ability

how to solve for the partial perimeter of a circle between two points of a cord if i am given the length of the cord and the radius of the circle?

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1.Let r be the number, that results when both the base and the exponent of a^b are tripled, where a and b are positive. If r=a^bx^b, where x is positive, then x equals? How do I solve 2(2r-4)/5=3r+6/4-3/2