book Maths Puzzle Numerical Ability

Dear Sir

We need to work out the area of a chord. Is there an equation for this - I am presuming pi is used somewhere? Any help would be gratefully appreciated.

With kind

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book Other Question
Please help me solve this equation:2x=-x+9 Discuss the difference between solving a system of two equations with two unknowns by graphing and by using the algebraic methods (substitution or addition).