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Topics: Starter  Angles  Geometry  Number  Shape
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Can you find polygons with angles all prime numbers?
Can you find polygons with angles all triangular numbers?
Can you draw one of the polygons above such that the perimeter, measured in cm, is a square number?
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=April7 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a related student activity.
A spreadsheet may assist students investigating totals of square numbers.
The Geometry Toolbox may assist students drawing the shapes.
See the National Curriculum page for links to related online activities and resources.