what are the main features of a population pyramid
Population pyramid Population pyramids often contain continuous stacked-histogram bars, making it a horizontal bar diagram. The population size is depicted on the x-axis (horizontal) while the age-groups are represented on the y-axis (vertical).[3] The size of the population can either be measured as a percentage of the total population or by raw number. Males are conventionally shown on the left and females on the right. Population pyramids are often viewed as the most effective way to graphically depict the age and distribution of a population, partly because of the very clear image these pyramids represent.[4]A great deal of information about the population broken down by age and sex can be read from a population pyramid, and this can shed light on the extent of development and other aspects of the population.
Great Pyramid of Giza The pyramid remained the tallest man-made structure in the world for over 3,800 years,[7] unsurpassed until the 160-metre-tall (520 ft) spire of Lincoln Cathedral was completed c. 1300. The accuracy of the pyramid's workmanship is such that the four sides of the base have an average error of only 58 millimetres in length.[8] The base is horizontal and flat to within ±15 mm (0.6 in).[9] The sides of the square base are closely aligned to the four cardinal compass points (within four minutes of arc)[10] based on true north, not magnetic north,[11] and the finished base was squared to a mean corner error of only 12 seconds of arc.[12]