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```def what_do_you_want ():
print ("1: Area of the rectangle")
print ("2: Square area")
print ("3: Area of the triangle")
print ("4: Trapezoidal area")
print ("5: Area of the circle")
print ("6: End program")

def area_rectangle_square():
print ("Enter a value in centimeters")
a = int(input("side length a:"))
b = int(input("side length b:"))
area = a * b
print("Area is", area, "cm2")

def square_area():
print ("Enter a value in centimeters")
a = int(input("side lenght: "))
square = a * a
print("Square area is", square, "cm2")

def area_triangle():
print ("Enter a value in centimeters")
a = int(input("Enter first side: "))
b = int(input("Enter second side: "))
c = int(input("Enter third side: "))
s = (a + b + c) / 2
area_triangle = (s*(s-a)*(s-b)*(s-c)) ** 0.5
print("The area of the triangle is: ", area_triangle, "cm2")

def trapezoidal_area():
print ("Enter a value in centimeters")
a = int(input("Base one value: "))
b = int(input("Base two value: "))
c = int(input("Enter height of trapezoid: "))
area_trapezoid = ((a + b) / 2) * c
print("Trapezoidal area is", area_trapezoid, "cm2")

def area_of_circle():
print ("Enter a value in centimeters")
a = int(input("Enter the radius of a circle: "))
PI = 3.14
area_circle = PI * a * a
print("Area of the circle is", area_circle, "cm2")

while True:
what_do_you_want()

choice = input("What do you want to do? ")

if choice == "1":
area_rectangle_square()

elif choice == "2":
square_area()

elif choice == "3":
area_triangle()

elif choice == "4":
trapezoidal_area()

elif choice == "5":
area_of_circle()

elif choice == "6":
break

else:
print("Incomprehensible choice, try again.")

```