How_To_Be_Good_At_Math

224 GEOMETRY • TYPES OF 3D SHAPE

Types of 3D shape

3D objects can be any shape or size, but there are some that you

will come across often in geometry. Let’s take a closer look at some

of the most common 3D shapes.

Circular

face

The opposite

faces are

identical

rectangles

Vertex

Sphere

A sphere is a round solid. It

has one surface and no edges

or vertices. Every point on the

surface is the same distance

from the sphere’s centre.

Cone

A cone has a circular base

and a curved surface, which

ends at a point directly above

the centre of its base.

Triangular-based pyramid

A triangular-based pyramid

is also called a tetrahedron. It

has four faces, four vertices, and

six edges. It’s unusual to see this

kind of pyramid in the real world.

Hemisphere

A hemisphere is the name

for half a sphere. It has one flat

surface and one curved face.

Cylinder

A cylinder has two identical

circular ends joined by one

curved surface.

Cuboid

A cuboid is a box-like

shape with six faces, eight

vertices, and 12 edges. Its

opposite faces are identical.

The flat faces of two

hemispheres can be put

together to make a sphere

224_225_3D_Types_of_3D_shapes.indd 224 29/02/2016 18:05