This document contains code to calculate the area and perimeter of different shapes: circles, squares, rectangles, and triangles. It defines functions for each shape calculation and gets input from the user for the relevant dimensions. A main loop allows the user to select which shape they want to analyze and calls the appropriate function to output the results.

1. def my_circle():
π = 3.14
r = float(input("Enter circle radius in cm: "))
A = (π*r*r)
P = ((π*r)*2)
print("area of circle is:", A , " cm^2")
print("Perimeter of circle is:", P , " cm")
def my_square():
l = float(input("Enter square length in CM: "))
A = (l*l)
P= (l*4)
print("area of square is:", A , " cm^2")
print("Perimeter of square is:" , P , " cm")

2. def my_rectangle():
l = float(input("Enter rect. length in CM: "))
w = float(input("Enter rect. width in cm: "))
A = (l*w)
P= ((l+w)*2)
print("area of rectangle is:", A , " cm^2")
print("Perimeter of rectangle is:" , P , " cm")
def my_triangle():
h = float(input("Enter height in CM: "))
b = float(input("Enter base in cm: "))
A = ((b/2)*h)
print("area of triangle is:", A , " cm^2")

3. while True:
print (" /////**** Wekcome to area and perimeter
calculator ****//////")
print ( " 1. square")
print ( " 2. rectangle")

4. print ( " 3. circle")
print ( " 4. triangle")
print ( " 5. Exit")
print ( )
A=int(input ("choose the 2D shape: " ) )
if A == 1:
my_square()

5. print ("End")
elif A == 2:
my_rectangle()
print ("End")
elif A ==3:
my_circle()
print ("End")

6. elif A == 4:
my_triangle()
print ("End")
elif A == 5:
break
else:
print (" Choose a proper selection")