What is a 3 D Shape This is

What is a 3 -D Shape? This is a cube (W De length p id th th ) height It has 3 dimensions – length, height and depth (width). All 3 -D shapes are solids.

Labeling the Parts of a 3 -D Shape A Cube Face – the flat surface of a 3 -D shape A cube has: 6 faces 8 vertices 12 edges Edge – a line where two faces meet Vertex (vertices) – the point where three or more faces meet (corner)

Prisms • a special kind of 3 D shape • has 2 bases and rectangular sides Examples of prisms: Hexagonal Prism Rectangular Prism Triangular Prism

Pyramids • a special kind of 3 D shape • has 1 base and triangular sides Example: Rectangular Pyramid or Square pyramid

The Shapes you need to Know SPHERE SQUARE-BASED CONE PYRAMID CUBE CYLINDER RECTANGULAR PRISM TRIANGULAR PRISM

Rectangular Prism Key Feature Six faces which are all rectangles. Faces 6 Vertices 8 Edges 12

Cube Key Feature Six faces which are all squares. Faces 6 Vertices 8 Edges 12

Triangular Prism Key Feature A prism with a triangular cross-section. Faces 5 Vertices 6 Edges 9

Sphere Key Feature Every point on the surface of the sphere is the same distance from the centre. Faces, Vertices and Edges The normal definitions of faces, vertices and edges are not appropriate for a sphere

Cylinder Key Feature A prism with a circular cross-section. Faces, Vertices and Edges The normal definitions of faces, vertices and edges are not appropriate for a cylinder. HOWEVER, there are 2 bases.

Cone Key Feature The point of the cone is directly above the centre of the circular base. Faces, Vertices and Edges The normal definitions of faces, vertices and edges are not appropriate for a cone. HOWEVER, there is 1 base.

Rectangular (Square-Based) Pyramid Key Feature A shape with a square base and triangular sides that meet at a point. Faces 5 Vertices 5 Edges 8

Check this out! 1. 3 D Shapes 1 - this is a game of matching pairs. 2. Can you arrange the shapes below in a chain so that each one shares a face (or faces) that are the same shape as the one that follows it? (The faces do not have to be the same size. )

Polyhedron vs. Geometric Solid • A polyhedron is in a subclass of geometric solids. The difference is that a polyhedron must have flat faces and straight edges.

Riddle #1 • • I am a geometric solid. I have six faces. All my faces are squares. What am I?

Riddle #2 • • • I am a geometric solid. I have two surfaces. My base is formed by a circle. I come to a point at the top. What am I?

Riddle #3 • I am a polyhedron. • I have the fewest number of faces of all the polyhedrons. • All of my faces are triangular. • I come to a point at the top. • What am I?

Riddle #4 • • I am a polyhedron. I have two triangular bases. My other faces are rectangles. Sometimes I am used for keeping doors open. • What am I?

Riddle #5 • • • I am a geometric solid. I have only one surface. My one surface is curved. I have no base. What am I?

Riddle Answers 1. Cube 2. Cone 3. triangular pyramid 4. triangular prism 5. sphere

Websites: • http: //www. teachin gideas. co. uk/maths /contents_shape 3 d. htm

Nets: A net is a flat pattern that can be folded to make a 3 -D shape.

Net 1

Net 2

Net 3

Net 4

Net 5

Net 6

Net 7