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Surface Area of Prisms and Cylinders

  • Prisms: Two bases formed by congruent polygons that lie in congruent planes
  • Lateral faces are not bases and are formed by parallelograms
  • Lateral edges are formed by the intersection of two adjacent lateral faces
  • The altitude measures the height of the prism
  • Right prism: A prism whose lateral edges are also altitudes
  • Oblique prism: A prism that is not right
  • Lateral area: The area of all the lateral faces of a prism
  • Surface area of a prism: The sum of the areas of its outer surfaces, or lateral area + 2(area of the base)
  • Cylinders have two bases that are parallel and congruent circles
  • The axis is the segment whose endpoints are centers of the circle
  • An altitude is a segment that measures the height
  • In a right cylinder, the axis is the same as the altitude; in an oblique cylinder, the axis is not the same as the altitude
  • Lateral area of a right cylinder = 2πrh
  • Surface area of a right cylinder = lateral area + 2(area of the circle)

Surface Area of Prisms and Cylinders

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Mathematics: Geometry