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While it is possible for a pyramid to have a square bases, you should not assume that all pyramids have square bases. Try to picture a triangular pyramid in your head, hopefully you can see that it is possible, and this would answer your question.
A square-based pyramid has, let's see, a top vertex, and 4 vertexes on its base (the part in the ground) for a total of 5 vertexes.
An age structure graph, also called a population pyramid, is a graphic description of the age and sex group distribution in a country's population. Please see the link for details.
look at "how do you make a pyramid?" to see
See link regarding population centers. This may give you enough to calculate what you need.
Around 28 millions (97 % of total population) per Pew Forum study as of October 2009. See link below.
Yes, the Great Pyramid of Giza is a square pyramid. From a birds eye view, you could see that the bottom is in the shape of a square. See: http://www.mathsisfun.com/geometry/pyramids.html
Trough the 'common sense' theory of the least effort: to build a pyramid, it had to be erected trough many ramps that allowed to carry heavy weights to the top of the pyramid, using the least effort. See related links for some examples.
yes
So that other people can see how a pyramid can have art in it.
A population pyramid is not a structure, like a pyramid in Egypt. It is a graphic presentation of the population of a country. in the horizontal is the amount of people, in the vertical their age. Since there are usually more young people than old people in a population (country), the figure tends to be wide in the bottom, and slowly becomes smaller as you go up. this indicates for every age how many people there are within a population (for example, country). The form is that of a triangle, or pyramid, with the top pointing up. If this figure is distorted, because for example many people were born in a certain period (often after wars end), then the figure will not look like a pyramid at all. this way you can easily see how the population is built up in categories of age. This is important because you will have to know how much working people there are, how many coming, and who will be taking care of you once your old. greets, dominique
Great pyramid are visible from far because of their massive size. Cairo Tower and el Citadel are the two places from where you can see the Great Pyramid.