Knife Holders
On 2021-08-18, New Zealand re-entered COVID-19 Alert Level 4, aka lockdown. One upside of lockdown is more time for arts and crafts.
Challenge 1: Construct with (pencil and) straightedge and compass only a regular pentagon. Solution here.
Challenge 2: Construct with compass only (the vertices of) a regular pentagon. Solution here.
Challenge 3: Construct with compass and straightedge only a regular heptagon (7 sides). 🥺 Anti-solution 3 here.
Trivia: Neodymium magnets were invented in what decade of the 20th century? Answer here.
Why no comments? Public comments take too much time to moderate and maintain, time better spent playing outside, but you can still email me private comments by clicking the 'Comment' link above.