introduction 3d shapes

3D shapes Welcome

To The Fascinating World Of

3D Shapes

Names of 3D shapes

Cube

cylinder

Sphere

ConeRectangular Prism Square

based

pyramid

Triangular basedpyramid

Triangular prism

Our Topic Of Discussion

• Cube.• Cylinder.• Sphere.• Prism.• Pyramid.

3D Shapes

• 3D shapes can be solid or hollow.• 3D Shapes has 3 dimension:– Length.– Width.– Height.

Now Some Technical Terms To Address3D Shapes

• Surface.• Face.• Base.• Edge.• Corner• Vertex (singular)/Vertices (plural)

Surface

• The curved part of a 3D shape.• Eg: Cylinder & Cone

Surface

Face

• Part of a 3D shape that is flat.

Base• The bottom

face of a 3D object.

Base

Edge

• The line where two faces meet on a 3D object.

6 Edges

5 Edges

Corner

• The point where three or more edges touch.

• This cube has 12 corners all together.

Vertex (Vertices)

• The point where three or more edges meet.• This cube has 12 vertices all together.

Cube

• A three-dimensional shape which has:

–6 Faces (All are of the same size)

–12 Edges

–8 Corners/Vertex

edge

vertex

face

Cylinder

• A three-dimensional shape which has:

–2 Faces

–1 Surface

–0 Edges

–0 Corners/Vertex

face

face

Surface

Sphere• A three-dimensional shape which has:

–0 Faces

–1 Surface

–0 Edges

–0 Corner /Vertex

Surface

• There are different types of prisms and they are based on the shape of its bases:

–Rectangular Prisms

–Square Prisms

–Triangular Prisms

–Hexagonal Prisms

Prism

Pyramids

• There are different types of pyramid and they are based on the shape of its bases:

• Have 1 base.• Have Triangular side faces that meet at one

Vertex.• Examples: Square Pyramid, Triangular Pyramid, Rectangular pyramid etc.

base

Triangular face

Square Pyramid

• A three-dimensional shape which has:

–5 Faces (1 square and 4 triangles)

–8 Edges

–5 Corner /Vertex

Rectangular Pyramid

A three-dimensional shape which has:

–5 Faces (1 Rectangular + 4 Triangles)

–8 Edges

–5 Corner /Vertex

Rectangular face

Triangular face

Prism Vs Pyramid

PRISM-At least 3 Faces that are Rectangles.-Two congruent faces on top and bottom called bases.-The shape of the base determines what type of prism the figure is.

PYRAMID-At least 3 Faces that are Triangles.-One base.-The shape of the base determines what type of prism the figure is.

Quiz Time!!

Let’s Play Naming the Shapes

What shape am I?• I have no flat faces.

• I have no straight edges.

• I have just one curved face.

I am a …………?

Well Done! I am a sphere!

What shape am I?• I have 6 flat square faces

• I have 12 straight edges

• I have 8 corners.

I am a …………?

Fantastic!I am a cube!

What shape am I?• I have one curved face

• I have 2 flat circular faces.

I am a …………?

I am a cylinder

How many edges does a square pyramid have?

a. 4b. 5c. 7d. 8

8 Edges

How many faces of a cube are squares?

a. 2b. 4c. 6d. 8

6