Area Of a Circle
The area of a circle is number of square units inside the circle. Standard formula to calculate the area of a circle is: A=πr². In this article we will show you, How to write python program to find area of circle using radius, circumstance and diameter
Python Program to find Area Of Circle using Radius
If we know the radius then we can calculate the area of a circle using formula: A=πr² (Here A is the area of the circle and r is radius).
PYTHON CODE
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# Python Program to find Area Of Circle using Radius PI = 3.14 radius = float(input(' Please Enter the radius of a circle: ')) area = PI * radius * radius circumference = 2 * PI * radius print(" Area Of a Circle = %.2f" %area) print(" Circumference Of a Circle = %.2f" %circumference) |
ANALYSIS: We defined pi as global variable and assigned value as 3.14. This program allows user to enter the value of a radius and then it will calculate the area of circle as per the formula.
OUTPUT
Python Program to find Area Of Circle using Circumference
Distance around the circle is called as circumference. If you know the circumference then we can calculate the area of a circle using formula: A= C²⁄ 4π (Here C is circumference)
PYTHON CODE
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# Python Program to find Area Of Circle using Circumference import math circumference = float(input(' Please Enter the Circumference of a circle: ')) area = (circumference * circumference)/(4 * math.pi) print(" Area Of a Circle = %.2f" %area) |
ANALYSIS:
First, We imported the math library and this supports us to use all the mathematical functions in Python programming. In this example we can call the PI value using math.pi
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import math |
Next line of code allows user to enter the value of a circumference.
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circumference = float(input(' Please Enter the Circumference of a circle: ')) |
Using the circumference, this program will calculate the area of circle as per the formula: A= C²⁄ 4π
OUTPUT
Python Program to Calculate Area Of a Circle using Diameter
Distance across the circle passing through the center is called as diameter. If we know the diameter then we can calculate the area of a circle using formula: A=π/4*D² (D is the diameter)
PYTHON CODE
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# Python Program to find Area Of Circle using Diameter import math diameter = float(input(' Please Enter the Diameter of a circle: ')) area1 = (math.pi/4) * (diameter * diameter) # diameter = 2 * radius # radius = diameter/2 radius = diameter / 2 area2 = math.pi * radius * radius print(" Area of Circle using direct formula = %.2f" %area1); print(" Area of Circle Using Method 2 = %.2f" %area2) |
ANALYSIS: This program allows user to enter the value of a diameter and then it will calculate the area of circle as per the formula we shown above.
We also mentioned other approach.
diameter = 2 * radius
radius = diameter/2
area = π * radius * radius
OUTPUT
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