The dual of an icosahedron (20 faces, 12 vertices) is a dodecahedron (12 faces, 20 vertices).pic.twitter.com/hMjtVmkAxk
Za najbolje sučelje na Twitteru koristite Microsoft Edge ili instalirajte aplikaciju Twitter iz trgovine Microsoft Store.
Making CAD tools. Previously @Dynamicland1 @NotionHQ
U tweetove putem weba ili aplikacija drugih proizvođača možete dodati podatke o lokaciji, kao što su grad ili točna lokacija. Povijest lokacija tweetova uvijek možete izbrisati. Saznajte više
Dodajte ovaj Tweet na svoje web-mjesto kopiranjem koda u nastavku. Saznajte više
Dodajte ovaj videozapis na svoje web-mjesto kopiranjem koda u nastavku. Saznajte više
Integracijom Twitterova sadržaja u svoje web-mjesto ili aplikaciju prihvaćate Twitterov Ugovor za programere i Pravila za programere.
| Država | Kod | Samo za korisnike |
|---|---|---|
| Sjedinjene Američke Države | 40404 | (bilo koje) |
| Kanada | 21212 | (bilo koje) |
| Ujedinjeno Kraljevstvo | 86444 | Vodafone, Orange, 3, O2 |
| Brazil | 40404 | Nextel, TIM |
| Haiti | 40404 | Digicel, Voila |
| Irska | 51210 | Vodafone, O2 |
| Indija | 53000 | Bharti Airtel, Videocon, Reliance |
| Indonezija | 89887 | AXIS, 3, Telkomsel, Indosat, XL Axiata |
| Italija | 4880804 | Wind |
| 3424486444 | Vodafone | |
| » Pogledajte SMS kratke šifre za druge zemlje | ||
Vremenska crta mjesto je na kojem ćete provesti najviše vremena i bez odgode dobivati novosti o svemu što vam je važno.
Prijeđite pokazivačem preko slike profila pa kliknite gumb Pratim da biste prestali pratiti neki račun.
Kada vidite Tweet koji volite, dodirnite srce – to osobi koja ga je napisala daje do znanja da vam se sviđa.
Najbolji je način da podijelite nečiji Tweet s osobama koje vas prate prosljeđivanje. Dodirnite ikonu da biste smjesta poslali.
Pomoću odgovora dodajte sve što mislite o nekom tweetu. Pronađite temu koja vam je važna i uključite se.
Bez odgode pogledajte o čemu ljudi razgovaraju.
Pratite više računa da biste dobivali novosti o temama do kojih vam je stalo.
Bez odgode pogledajte najnovije razgovore o bilo kojoj temi.
Bez odgode pratite kako se razvijaju događaji koje pratite.
The dual of an icosahedron (20 faces, 12 vertices) is a dodecahedron (12 faces, 20 vertices).pic.twitter.com/hMjtVmkAxk
Here's an animation showing an icosahedron transforming into a dodecahedron and back again.pic.twitter.com/X0eGEItLzz
If you take the duals of the 13 Archimedean Solids, you get the 13 Catalan Solids!
Because we're swapping faces with vertices, all the properties also swap!
Faces are identical
Vertices are identical
Faces are regular polygons
Angles around any vertex are equalpic.twitter.com/UT9LY0imL7
For example, the dual of the icosidodecahedron (an Archimedean Solid with 32 faces and 30 vertices) is the rhombic triacontahedron (a Catalan Solid with 30 faces and 32 vertices).pic.twitter.com/zBK92I6k3e
Faces are identical
Faces are regular polygons
On the rhombic triacontahedron, the faces are all the same but they're no longer regular, in this case they're a rhombus (diamond) shape.pic.twitter.com/Z9D4vb1Oiw
Vertices are identical
Angles around any vertex are equal
At every vertex, the angles go around regularly. But there are two classes of vertices, those where 5 shapes meet and those where 3 shapes meet. These correspond to the pentagons and triangles of the dual!pic.twitter.com/OJCFNLwfuX
I came upon the Catalan Solids while working on "Sun Seeds", a sculpture collaboration with @mokeymuffin and @notlion.pic.twitter.com/mloEJDCNIP
The properties of the Catalan Solids were perfect for evoking the symmetries of flowers and microscopic plant life that inspired our project. Below is an electron microscope image of pollen from a variety of plants.pic.twitter.com/v6ehHdbWtq
I based my "Mint" Sun Seed on the rhombic triacontahedron. There are 30 identical pieces. Every vertex is a flower. Can you find the big flowers with 5 petals and the small ones with 3 petals?pic.twitter.com/J3vHf4dM9m
The "Lotus" Sun Seed, designed by @mokeymuffin, is based on the pentagonal hexecontahedron.
It has 12 large flowers where 5 pieces come together and 80 small flowers where 3 pieces come together.pic.twitter.com/DtI9FM6HpL
We are making a small batch of Sun Seed Kits!
https://www.indiegogo.com/projects/sun-seeds/ …
Check it out if you're interested in making your own color-changing, geometric sculptures. Our crowdfund ends in 2 days!pic.twitter.com/hrPMmiPFzC
I hope you enjoyed this introduction to the Catalan Solids, Platonic Solids, Archimedean Solids, and the concept of "dual" shapes. You can read more on Wikipedia https://en.wikipedia.org/wiki/Catalan_solid … The GIFs showing a shape turning into its dual came from this page https://www.antiprism.com/album/815_truncations/imagelist.html …
Twitter je možda preopterećen ili ima kratkotrajnih poteškoća u radu. Pokušajte ponovno ili potražite dodatne informacije u odjeljku Status Twittera.