If anyone still needs this, here's my answer from Edge2020:
A traveler who plans to spend several thousand dollars as they travel over a period of two months may experience a shortage, or lack, of a country's currency due to constant fluctuation of the currency exchange rates. If the rates go up, the individual may not be able to afford major travel expenses like meals and lodging. It may limit their ability, also, to pay admission fees for tourist attractions or purchase souvenirs as a memory of their trip.
With currency exchange rates constantly fluctuating it might affect the currency exchange plans of a traveler who plans to spend several thousand dollars as they travel over a period of two months because the traveler may encounter situations where his dollars may not be enough to be exchanged at any decent amount of currency in the country where he/she is in. This poses a serious problem especially if he/she does not have lodging or food ready in that said country.
that can help because all you need to remember is that the sum of the angles in a triangle is half of the sum of the angles that add up in a quadrilateral.
