??????, ???? ??? ???????? ??? ???? ?? ???????????? ?? ?????? ?? ?????????? ??? ?????????? ???????? ?????????? ?? ??? ???? ?????.?? ????? ????????? ????? ?????? ??????????? ??? ???????????? ???? ?????????/???????? ??? ????????;???? ????? ????? ??? ?????? ?? ?? ????????? ??? ?? ?????? ????? ??????? ??? ?? ?? ??????????. To the surface area, the two