exam Maths Puzzle Numerical Ability

A plot of land the shape of a sector has a radius of 100' and an aggle of 110 degrees. Determine the area of athis plot of land.

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You are given an initial stake of one dollar. A coin will be tossed indefinitely until it lands on tails. Every time it lands on heads, your prize will be doubled. When it lands on how do u factor a polynomial when it is a^2-4 is that prime since there are no factors that can be simplyfied is there a step by step solution?