Why is Rwanda's total country population and total land area significant in business terms?
Since you have tagged this with "International Business," I assume that you are asking this question in the context of economics and business (and I have edited the question to show this). If so, the area and population of Rwanda are important because they have some impact on the economic prospects for companies that want to do business there.
Rwanda is a very small country. Its total land area is slightly lower than the total land area of the American state of Maryland. Rwanda has a population of about 11 million people, which is about the same as the population of Ohio.
In economic terms, the main thing that this tells us is that Rwanda is not a very big market. This means that it is very difficult for Rwandan companies to grow large and prosperous if they serve only the domestic market. It means that there could be opportunities for multinational corporations to exploit the Rwandan market. If big companies already have a presence in neighboring countries, they could expand into Rwanda. The economies of scale that they enjoy through selling to a larger international market would allow them to outcompete domestic Rwandan companies.