book Maths Puzzle Numerical Ability

a sector of a circle has area 8.1pi cm squared and central angle 36 degrees. find its radius and arc length.

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book Other Question

Find the slopes of the asymptotes of a hyperbola with the equation y^2=36+4x^2 a piece of work can be done in 34 days by 25 men. After 16 days, 10 men quit work. in how many more days can the rest finish the work?