and tangram angles
having a restricted set of angles, that are multiples of 45 degrees, provides opportunities to reason about the angles involved (on a grid) and the angle sums that
form the interior angles of polygons
a ppt is here
initial practice of multiples of 45 degrees angles:
students call out the angles
(chanting in unison...)
create some polygons by fitting squares and isosceles right angled triangles together
what are the possibilities?
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