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                # Python 程序:計算三角形的面積 > 原文: [https://www.programiz.com/python-programming/examples/area-triangle](https://www.programiz.com/python-programming/examples/area-triangle) #### 在此程序中,您將學習計算三角形的面積并顯示它。 要理解此示例,您應該了解以下 [Python 編程](/python-programming "Python tutorial")主題: * [Python 輸入,輸出和導入](/python-programming/input-output-import) * [Python 數據類型](/python-programming/variables-datatypes) * [Python 運算符](/python-programming/operators) * * * 如果`a`,`b`和`c`是三角形的三個邊。 然后, ```py s = (a+b+c)/2 area = √(s(s-a)*(s-b)*(s-c)) ``` ## 源代碼 ```py # Python Program to find the area of triangle a = 5 b = 6 c = 7 # Uncomment below to take inputs from the user # a = float(input('Enter first side: ')) # b = float(input('Enter second side: ')) # c = float(input('Enter third side: ')) # calculate the semi-perimeter s = (a + b + c) / 2 # calculate the area area = (s*(s-a)*(s-b)*(s-c)) ** 0.5 print('The area of the triangle is %0.2f' %area) ``` **輸出** ```py The area of the triangle is 14.70 ``` 在此程序中,使用 [Heron 公式](http://en.wikipedia.org/wiki/Heron%27s_formula "Heron's formula to calculate semi-parameter to a triangle")給出三個邊時,將計算三角形的面積。 如果需要根據用戶輸入來計算三角形的面積,則可以使用[`input()`函數](/python-programming/methods/built-in/input "Python input() function")。
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