Transcript math-mr-men-poster-pack

Area = (length of side)2
Dipentagram
A dipentagram is a kind of truncated
star. In fact, many complex shapes do
not have ‘official’ names.
Instead, they are often just described by
their properties – so there may be
several different names for this shape!
Harriot showed how, if the number of
cannonballs is given, one can compute
the number of cannonballs to be placed
in the base of a pyramid with a
triangular, square or oblong base.