Сумма сторон квадрата 40 см. Какова его площадь?

I had a nightmare last night. Can I check your copybook? It was a disaster in UK. I miss you very much. My flight was delay. I have realized that I have forgot to give you a keys. You have upset me. My check-in time is 9.00 am. I can't miss my flight because of you. Traffik is bad,please select alternative way to home.