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import math# 计算圆的面积def circle_area(radius):	return math.pi * radius * radius# 计算圆的周长def circle_perimeter(radius):	return math.pi * radius * 2rad = float(input("请输入圆的半径： "))if rad <= 0:	print("请输入，有效的半径")else:	result_1 = circle_area(rad)	result_2 = circle_perimeter(rad)	print("%s半径圆的面积是：%s "%(rad,result_1))	print("%s半径圆的周长是：%s "%(rad,result_2))# 计算矩形的面积def rectangular_area(long, wide):	return long * wide# 计算矩形的周长def rectangular_perimeter(long, wide):	return 2 * (long + wide)long, wide = eval(input("请分别输入矩形的长和传宽： "))if long <= 0 and wide <= 0:	print("请输入，有效的长和宽")else:	result_1 = rectangular_area(long, wide)	result_2 = rectangular_perimeter(long, wide)	print("{}长、{}宽的矩行面积是： {}".format(long, wide, result_1))	print("{}长、{}宽的矩行周长是： {}".format(long, wide, result_2))

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