there difference between float and double size of float is 4 byte = 32 bit and size of double is 8 byte = 64 bit.
give the mark to yourself 
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PI is defined as a double in Java (ref) and you don't need to cast the return to double since everything will be promoted to double for the math operations since they involve at least one double.
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please remember to follow the naming conventions
Taifun
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