#try to avoid input function a = input("enter any string(triangle,square,rectangle)") if a == "triangle": b = int(input("Enter base of the triangle")) c = int(input("Enter height of the triangle")) print((1/2)*b*c) elif a == "square": b = int(input("Enter side of the square.")) print(b*b) elif a == "rectangle": b = int(input("Enter lenght of the rectangle")) c = int(input("Enter width of the rectangle")) print(b*c) else: print("Invalid Input")