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- https://math.libretexts.org/Courses/Las_Positas_College/Math_for_Liberal_Arts/09%3A_Geometry/9.02%3A_PolygonsThe sum of the three angles of a triangle is 180°. One of the angles has a measure of 90° as it is a right triangle. Since the sum of the interior angles of any triangle is 180° and there are two tria...The sum of the three angles of a triangle is 180°. One of the angles has a measure of 90° as it is a right triangle. Since the sum of the interior angles of any triangle is 180° and there are two triangles in a quadrilateral, the sum of the angles for each quadrilateral is 360°.
- https://math.libretexts.org/Courses/Santiago_Canyon_College/HiSet_Mathematica_(Lopez)/12%3A_Geometria/12.03%3A_Volumen_de_Solidos_GeometricosVivir en un mundo bidimensional sería bastante aburrido. Agradecidamente, todos los objetos físicos que ves y usas todos los días —computadoras, teléfonos, autos, zapatos— existen en tres dimensiones....Vivir en un mundo bidimensional sería bastante aburrido. Agradecidamente, todos los objetos físicos que ves y usas todos los días —computadoras, teléfonos, autos, zapatos— existen en tres dimensiones. En el mundo de la geometría, es común ver figuras tridimensionales. Los poliedros son formas que tienen cuatro o más caras, siendo cada una un polígono. Estos incluyen cubos, prismas y pirámides. A veces incluso se pueden ver figuras individuales que son compuestos de dos de estas figuras.
- https://math.libretexts.org/Bookshelves/Applied_Mathematics/Math_For_Liberal_Art_Students_2e_(Diaz)/06%3A_Geometry/6.03%3A_Volume_of_Geometric_SolidsLiving in a two-dimensional world would be pretty boring. Thankfully, all of the physical objects that you see and use every day—computers, phones, cars, shoes—exist in three dimensions. In the world ...Living in a two-dimensional world would be pretty boring. Thankfully, all of the physical objects that you see and use every day—computers, phones, cars, shoes—exist in three dimensions. In the world of geometry, it is common to see three-dimensional figures. Polyhedrons are shapes that have four or more faces, each one being a polygon. These include cubes, prisms, and pyramids. Sometimes you may even see single figures that are composites of two of these figures.
- https://math.libretexts.org/Courses/Chabot_College/Math_in_Society_(Zhang)/02%3A_Geometry/2.03%3A_Volume_of_Geometric_SolidsLiving in a two-dimensional world would be pretty boring. Thankfully, all of the physical objects that you see and use every day—computers, phones, cars, shoes—exist in three dimensions. In the world ...Living in a two-dimensional world would be pretty boring. Thankfully, all of the physical objects that you see and use every day—computers, phones, cars, shoes—exist in three dimensions. In the world of geometry, it is common to see three-dimensional figures. Polyhedrons are shapes that have four or more faces, each one being a polygon. These include cubes, prisms, and pyramids. Sometimes you may even see single figures that are composites of two of these figures.
