from tkinter import *
root = Tk()
root.title("soma de ângulos internos de um polígono ")
root.geometry("400x300")
root.resizable(0, 0)
root.config(bg="#d9ead3")
def app():
    n = n_lados.get()
    s = (n-2)*180
    resultado.set(s)
def limpar():
    n_lados_entrada.delete(0, END)
titulo = Label(text="Soma de ângulos internos de um polígono",
               font=("Arial", "13", "bold"),bg="#d9ead3",fg="#bf9000")
titulo.place(relx=0.05, rely=0.05)

texto_sub1  = Label(text="Número de Lados:",
                    font=("Arial", "13", "bold"),bg="#d9ead3",fg="#bf9000")
texto_sub1.place(relx=0.15, rely=0.35)

n_lados = IntVar()
n_lados_entrada = Entry(textvariable=n_lados,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
n_lados_entrada.place(relx=0.55, rely=0.35, relwidth=0.25)

but1 = Button(text="Calculadora", bd=2, bg='#107db2', fg='white',
              font=('verdana', 10, 'bold'), command=app)
but1.place(relx=0.05, rely=0.55, relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 10, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.55, relwidth=0.25, relheight=0.1)
but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 10, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.55, relwidth=0.25, relheight=0.1)
resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"),bg="#d9ead3" )
resultado_texto.place(relx=0.5, rely=0.75, relwidth=0.3,relheight=0.08)

texto_sub3= Label(text=f"Soma de Ângulos :",
                    font=("Arial", "13", "bold"),bg="#d9ead3",fg="#bf9000")
texto_sub3.place(relx=0.15, rely=0.75)
root.mainloop()