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 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°.
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 ...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.
