Phil Tulga
Learn how to fold origami poppers out of paper. It helps to develop spatial sense by working with geometric shapes, and it also makes a surprisingly loud popping sound!
Peter Weatherall
Learn the names of the polygons with Peter Weatherall’s Polygon Song.
youcubed (Stanford University)
A trapezoid is a quadrilateral with 2 parallel sides
NRICH (University of Cambridge)
Polygons drawn on square dotty paper have dots on their perimeter (p) and often internal (i) ones as well. Find a relationship between p, i and the area of the polygons.
NRICH (University of Cambridge)
How many diagonals does a regular icosagon (20 sides) have?
National Council of Teachers of Mathematics
How many different hearts can you make?
National Council of Teachers of Mathematics
If the diagram were continued to include the entire pentagon and the entire square, which shape would extend below the other?