Geometry - 3D Shapes (Sphere, Hemisphere, Ellipsoid, Cone And Frustum)
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00:00Hi kids! Today we will learn various 3D shapes and their characteristics.
00:10Let us start with a sphere.
00:15A sphere is a perfectly round and circular 3D shape that resembles the shape of a completely round ball.
00:28It has only one face, which is spherical.
00:35And it has no vertex and edge.
00:40These are few objects spherical in shape.
00:46Now, let's learn another shape that is hemisphere.
00:54Hemisphere refers to half of a sphere.
00:59It has two faces.
01:03One is this flat surface, which is completely round and other one is this curved surface.
01:14It has no vertex and it has one round edge.
01:22These are few objects which are hemispherical in shape.
01:28Now, let's learn another interesting shape, ellipsoid.
01:36An ellipsoid is a 3D shape resembling a flattened sphere.
01:44It has only one face, which is its surface, which is ellipsoid shape.
01:52And it has no vertex and edge.
01:58These are few objects which are ellipsoid in shape.
02:05Now, let's learn another shape, cone.
02:11A cone is a 3D shape that tapers smoothly from a circular base to a point called its vertex.
02:24It has one vertex, which is the tip of the cone.
02:32It has one edge, which is round in shape.
02:37Now, let's see its faces.
02:42One of the face is round shape on its bottom.
02:48Other face is a curved surface of the cone that wraps around it.
02:56These are a few things that have cone shape.
03:02Now, let's learn another shape, that is a frustum.
03:13Frustum is a 3D shape, which is a part of a conical solid, left after cutting off a top portion like this.
03:26It has three faces.
03:32Two round shape faces, one at the top and one at the bottom.
03:40And third faces is its curved surface.
03:46So, it has two edges, which are round in shape.
03:52Three faces and no vertex.
03:57These are a few objects, that is, frustum in shape.
04:04So, kids, we have learned various 3D shapes.
04:10You may go through them again and again to learn more.
04:16Now, you may go ahead and take a quiz to learn more.
04:20Bye-bye.