public BigDecimal getArea$()$

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return null;

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$\frac{?}{?}****$

Returns the perimeter of the circle.

@return the perimeter of the circle.

$*/$

public BigDecimal getPerimeter$()$

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return null;

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$\frac{?}{?}****$

Sort the array in ascending order by perimeter size.

@param ar the array to used for sorting, not altered.

@return a new new sorted array;

$*/$

public static Circle$2$DBig$[]$ sortCirclesByPerimeter$($Circle$2$DBig$[]$ ar$)$

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return null;

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$\frac{?}{?}****$

Sort the array in ascending order by the times a circle overlaps all

other circles in the array. It returns a new sorted array. You compare

every circle with all other circles. If overlaps with none should be

placed first. If overlaps with all others it should be placed last. Tie

is resolved by using perimeter$-$size. Smaller perimeter first.

@param ar the array to used for sorting, not altered.

@return a new new sorted array;

$*/$

public static Circle$2$DBig$[]$ sortCirclesByNumberOfTimesOverlapping$($Circle$2$DBig$[]$ ar$)$

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$//$write code

return null;

$\}$