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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/Mount_Royal_University/Mathematical_Reasoning/4%3A_Basic_Concepts_of_Euclidean_Geometry/4.3%3A_3-D_GeometryPolyhedra are simple 3D closed surfaces that are composed of polygonal regions.
- 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.
- https://math.libretexts.org/Courses/Northeast_Wisconsin_Technical_College/College_Technical_Math_1A_(NWTC)/07%3A_Geometry/7.06%3A_Pyramids_and_ConesThis page covers the geometry of pyramids and cones, detailing their volume and surface area calculations. It defines pyramids by their polygonal bases and triangular faces, and cones by their circula...This page covers the geometry of pyramids and cones, detailing their volume and surface area calculations. It defines pyramids by their polygonal bases and triangular faces, and cones by their circular base. The formulas show that pyramids and cones have one-third the volume of their corresponding prisms and cylinders. Exercises focus on calculating volume and surface areas, and a practical exercise involves calculating the volume of a propane tank.
