Python 程序：求圓的直徑周長和面積

用實例編寫 Python 程序求圓的直徑周長和面積。數學公式為:

1. 圓的直徑= 2r = 2 *半徑
2. 圓的面積是:A = πr = π 半徑半徑
3. 圓的周長= 2πr = 2 π 半徑

找到圓的直徑周長和面積的 Python 程序示例 1

這個 Python 程序允許用戶輸入圓的半徑。通過使用半徑值，這個 Python 代碼可以找到圓的周長、直徑和面積。

提示:參考尋找圓的面積文章，了解尋找蟒圓的面積的各種方法。

# Python Program to find Diameter, Circumference, and Area Of a Circle

PI = 3.14
radius = float(input(' Please Enter the radius of a circle: '))

diameter = 2 * radius
circumference = 2 * PI * radius
area = PI * radius * radius

print(" \nDiameter Of a Circle = %.2f" %diameter)
print(" Circumference Of a Circle = %.2f" %circumference)
print(" Area Of a Circle = %.2f" %area)

計算圓的直徑、周長和面積的 Python 程序示例 2

這個 python 代碼查找圓的直徑、周長和面積同上。但是，我們使用 Python 函數分離了邏輯。

# Python Program to find Diameter, Circumference, and Area Of a Circle
import math

def find_Diameter(radius):
    return 2 * radius

def find_Circumference(radius):
    return 2 * math.pi * radius

def find_Area(radius):
    return math.pi * radius * radius

r = float(input(' Please Enter the radius of a circle: '))

diameter = find_Diameter(r)
circumference = find_Circumference(r)
area = find_Area(r)

print("\n Diameter Of a Circle = %.2f" %diameter)
print(" Circumference Of a Circle = %.2f" %circumference)
print(" Area Of a Circle = %.2f" %area)

蟒蛇直徑和圓周輸出

 Please Enter the radius of a circle: 12

 Diameter Of a Circle = 24.00
 Circumference Of a Circle = 75.40
 Area Of a Circle = 452.39