Geometry

# prisms

A **prism** is a polyhedron that is limited by two equal polygons called bases and parallelograms called lateral faces.

The **height of the prism** is the distance between the planes that contain the bases.

If all the lateral faces are rectangles we call it **right prism** and if they aren’t we call it **oblique prism**.

If the bases are triangles, squares, rectangles, pentagons, we call it **triangular prism, square prism, rectangular prism (cuboid), pentagonal prism**,…

*Development of a right prism and its area*

* *

The area of a prism is the addition of all the areas of its faces.

**Exercises**:

1.- Calculate the total area of a prism whose base is a rhombus with diagonals of 12 and 18 cm.

2.- Calculate the total area of a triangular prism whose base is a equilateral triangle of side 10 m and whose height is 20 m

Solutions: 1) 1254.72 cm

^{2}; 2) 687 m^{2}* *

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