 
      
      Illustration of a cone of revolution used to show that the lateral area is equal to half the product…
 
      
      "The lateral area of a frustum of a cone of revolution is equal to half the sum of the circumferences…
 
      
      An illustration of a right circular cone with labels on slant height and altitude.
 
      
      An illustration of a regular pyramid with a square base and labels on lateral edge, slant height, altitude,…