Prisms intro

​Prisms

Image credit: Kelvinsong - Own work, CC0, commons.wikimedia.org/w/index.php?curid=27487197

Prisms are shapes with constant cross-section (red) which is always the same as the base (blue):

A triangular-based prism
(the base is a triangle)

A pentagonal-based prism
(the base is a pentagon: it has
five sides)

Match

Match 'em!
lateral = side
base = bottom

edge = 1D (a knife's edge!)

oblique = slanting/awry

Lateral face

Bases

Lateral edge

▱
Oblique prism

Height

• Lateral face

• Bases

• Lateral edge

• ▱
  Oblique prism

• Height

Multiple Choice

What do we commonly call a right, rectangular-based prism?

(🤖android = looks like a man.)

• A square prism

• A right- quadrilateral prism

• A cuboid

• A cube

  🧊

• Minecrafty

  ⛏

Multiple Choice

True of false?
Every prism has an even number of face diagonals

• True

• False

Multiple Choice

True of false?
There is a prism with no space diagonals whatsoever!

• True

• False

Multiple Choice

True of false?
The length of the lateral edges is always longer than the height.

• True

• False

Multiple Choice

True of false?
A right regular-hexagonal-based prism has 18 space diagonals in total

• True

• False