Areas of Polyhedra

The surface area of a right prism whose base is a regular polygon.

For a regular polygon, the area of the base is calculated by multiplying its perimeter by its apothem and dividing it by 2.

The lateral area of this prism forms a rectangle, its surface area is calculated by multiplying the perimeter of the base by the height of the prism.

To find the total surface area of a prism, we add up the area of its two bases and the lateral area.


You can rotate the figure by moving the red dot. What you are going to measure has to be straight.

Move the ruler from its ends, one after the other.

Do measurements in centimetres, if the value is not a whole number, use a decimal number.

Write down each measurement in the box below and hit Enter. If it is correct, it will appear in the window.

Do the necessary calculations to find the perimeter of the base, the surface area of the base and the lateral surface area. Write it down in the corresponding boxes below.

Take  the corresponding units to each yellow circle.

  Eduardo Barbero Corral
Spanish Ministry of Education , Social Afairs and Sport. Year 2007

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