from tkinter import *
import math

root = Tk()
root.geometry("500x300")
root.resizable(0, 0)
root.config(bg="#0a3f78")
root.title("Perímetro e Área de um Heptágono Regular")

titulo = Label(text="Perímetro e Área de um Heptágono Regular",
               font=("Arial", "17", "bold"), bg="#0a3f78", fg="#15d1bb")
titulo.place(relx=0.03, rely=0.05)

texto_sub1 = Label(text="Lado: ",
                   font=("Arial", "25", "bold"), bg="#0a3f78", fg="#15d1bb")
texto_sub1.place(relx=0.25, rely=0.3)

lado = DoubleVar()
lado_entrada = Entry(textvariable=lado,
                     font=("Arial", "12", "bold"),
                     bg="white", fg="blue", justify='center')
lado_entrada.place(relx=0.55, rely=0.34, relwidth=0.25)


def limpar():
    lado_entrada.delete(0, END)
    resultado.set("")


def app():
    l = lado.get()
    perimetro = 7 * l
    area = (7 * l ** 2) / (4 * math.tan(math.pi / 7))
    mensagem = f"Área do heptágono regular: {round(area, 2)} " \
               f"\nPerímetro do heptágono regular: {round(perimetro, 2)}"

    resultado.set(mensagem)


but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.5, relwidth=0.25, relheight=0.15)

but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.5, relwidth=0.25, relheight=0.15)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                  font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.5, relwidth=0.25, relheight=0.15)

resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                        font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.7, relwidth=0.9, relheight=0.25)

root.mainloop()