exam Maths Puzzle Numerical Ability

find the diameter
circumference=283m
I know the formula:d=C/pi
but need step by step help in decimals divided by whole numbers

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exam Other Question

What is the area of an ellipse with the major axis 20 m and the minor axis 10 m? Solve 3x(to the 3rd)+7x(squared)-22x-8=0, given that negative one third is a solution.