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#polydron

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foldworks<p>Polydron special offer: Use code ATM10 for 10% off your Polydron order (offer ends 30 September 2025) <br /><a href="https://www.polydron.co.uk/shop.html" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="">polydron.co.uk/shop.html</span><span class="invisible"></span></a></p><p><a href="https://mathstodon.xyz/tags/coupons" class="mention hashtag" rel="tag">#<span>coupons</span></a> <a href="https://mathstodon.xyz/tags/coupon" class="mention hashtag" rel="tag">#<span>coupon</span></a> <a href="https://mathstodon.xyz/tags/discounts" class="mention hashtag" rel="tag">#<span>discounts</span></a> <a href="https://mathstodon.xyz/tags/polydron" class="mention hashtag" rel="tag">#<span>polydron</span></a> <a href="https://mathstodon.xyz/tags/offer" class="mention hashtag" rel="tag">#<span>offer</span></a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="tag">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/MathematicsTeaching" class="mention hashtag" rel="tag">#<span>MathematicsTeaching</span></a> <a href="https://mathstodon.xyz/tags/atm" class="mention hashtag" rel="tag">#<span>atm</span></a> <a href="https://mathstodon.xyz/tags/MT" class="mention hashtag" rel="tag">#<span>MT</span></a> <a href="https://mathstodon.xyz/tags/MT295" class="mention hashtag" rel="tag">#<span>MT295</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="tag">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="tag">#<span>MathEd</span></a> <a href="https://mathstodon.xyz/tags/Math" class="mention hashtag" rel="tag">#<span>Math</span></a> <a href="https://mathstodon.xyz/tags/Education" class="mention hashtag" rel="tag">#<span>Education</span></a></p>
foldworks<p>‘Exploring triangles at the Institute of Mathematics Pedagogy (IMP)’<br />Tandi Clausen-May reflects on an exploration of 3D shapes made from triangles.</p><p><a href="https://atm.org.uk/write/MediaUploads/Journals/MT295/03.pdf" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="ellipsis">atm.org.uk/write/MediaUploads/</span><span class="invisible">Journals/MT295/03.pdf</span></a></p><p>One of the two free articles from Mathematics Teaching 295 for non-members.<br /><a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="tag">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/triangle" class="mention hashtag" rel="tag">#<span>triangle</span></a> <a href="https://mathstodon.xyz/tags/helix" class="mention hashtag" rel="tag">#<span>helix</span></a> <a href="https://mathstodon.xyz/tags/polydron" class="mention hashtag" rel="tag">#<span>polydron</span></a> <a href="https://mathstodon.xyz/tags/MathematicsTeaching" class="mention hashtag" rel="tag">#<span>MathematicsTeaching</span></a> <a href="https://mathstodon.xyz/tags/atm" class="mention hashtag" rel="tag">#<span>atm</span></a> <a href="https://mathstodon.xyz/tags/MT" class="mention hashtag" rel="tag">#<span>MT</span></a> <a href="https://mathstodon.xyz/tags/MT295" class="mention hashtag" rel="tag">#<span>MT295</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="tag">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="tag">#<span>MathEd</span></a> <a href="https://mathstodon.xyz/tags/Math" class="mention hashtag" rel="tag">#<span>Math</span></a> <a href="https://mathstodon.xyz/tags/Education" class="mention hashtag" rel="tag">#<span>Education</span></a> <a href="https://mathstodon.xyz/tags/mathematics" class="mention hashtag" rel="tag">#<span>mathematics</span></a></p>
foldworks<p>Do you know a pleasing way to colour the 20 faces of a regular icosahedron with 4 colours (so that faces meeting at an edge are different colours)? Or equivalently, can you colour the 20 vertices of a regular dodecahedron with four colours (so that vertices at each end of of an edge are different colours)? <br />You might wonder why use only 4 colours? The reason is that a sample <a href="https://mathstodon.xyz/tags/polydron" class="mention hashtag" rel="tag">#<span>polydron</span></a> pack has 20 equilateral triangles in only 4 colours.<br /><a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="tag">#<span>geometry</span></a> <a href="https://mathstodon.xyz/tags/mathart" class="mention hashtag" rel="tag">#<span>mathart</span></a></p>
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