This census data had understated the number of Italians in the city area and this mistake seems to be confirmed by a series of subsequent events. Indeed, following the Treaty of Rapallo, the Italians of Dalmatia could opt for the acquisition of Italian citizenship instead of the Yugoslavian one, while maintaining residence: despite a violent campaign of intimidation on the part of Yugoslavia, over 900 families of Italian speaking "Spalatini" had exercised the option to be Italians. Furthermore, in 1927 was carried out a Census of Italians living outside Italy: in Spalato and surrounding area were counted 3,337 Italian citizens.
So, given that about 1,000 Italians (with their families) left the city following its incorporation into the Kingdom of Serbs, Croats and Slovenes, and estimating a certain percentage of Italians who accepted the "forced" Yugoslavian citizenship, it is really possible that 7,000 Italians in the Spalato area -as said by Antonio Tacconi- obtained membership in Italian associations of Spalato in 1918/1919: this amount is more than 3 times the data from the 1910 Austrian Census.
After the Austrian defeat, in the first half of November 1918 Italian troops occupied the Dalmatian territories assigned to Italy by the 1915 Pact of London. Spalato (the city was officially called "Split" only after the 1919 Paris Peace Conference) was not one of those areas, but the Italians sent some ships and occupied the city as agreed with the Allies.
The Yugoslavian nationalists, who controlled the city with their "National Guard", soon showed huge hostility toward the Italian troops, fearing they could remain forever in the city. Even the arrival of slav refugees from the London Pact Italian-occupied areas increased the tensions: those refugees were responsible for most of the incidents in the next 2 years.
On November 9, 1918 two French destroyer entered the port of Spalato. The Italians - mostly concentrated within the old city - exposed on the windows of their homes the Italian tricolor and went to the harbor to celebrate the Triple Entente. But the reaction of the Yugoslavian National Guard was immediate: they entered by force in the apartments, tore down the flags, beat some of those present and damaged the furniture. Meanwhile, the Austrian commander of a ship already docked at the port (and now with Yugoslavian flag) ordered with the megaphone to remove the flags, threatening to open fire.
This was the first of a long series of incidents, which also saw the creation of a classic pattern of propaganda that would be found very often in the next months: the Croatian newspapers - and especially the most extreme of them, "Novo Doba", denounced the "Italian provocation". The Italians, however, created a complaint report and forwarded it to the Allies. In the following days the municipal Croatian authorities of Spalato were forced to submit a formal apology for the incident.
But other incidents and demonstrations against Italy and the Dalmatian Italians happened in other cities, like Trau and the "Castelli". The worst happened on December 23 when groups of fanatical Slavs destroyed the offices of the main Italian institutions in Spalato (the "Fascio Nazionale", the "Gabinetto di Lettura" and the "Società Operaia") and hit many dozens of Italians on the streets, while destroying a lot of Italian-owned shops. The same happened on January 6, 1919 in Trau.
Italian Admiral Enrico Millo, who was just promoted to Governor of Dalmatia for the area occupied by Italy, quickly sent ships to defend the Italians of Spalato: on January 12 arrived the destroyer "Puglia" in the port of the city, between huge protests from the Slav community.
On February 24, while an "Allies Commission for the Adriatic" (made of US admiral Albert P. Niblack, French admiral Jean-Etienne-Charles-Marcel Ratyè, British admiral Edward Burton Kiddle and Italian admiral Umberto Cagni) was visiting Spalato, a huge group of Slavs -in order to show that they were the majority in Spalato and rejected the Italians- attacked the Italian sailors of the "Puglia": the captain Giulio Menini was hit together with some Italians walking on the nearby streets, and again were damaged some shops owned by the Italian community. The Croatian authorities were forced to do another apology and until summer there were only minor incidents.
But on September 12 Gabriele D'Annunzio occupied Fiume (actual "Rijeka") and later went even to Zara. As a consequence the Italian count Fanfogna organized a similar tentative of occupation in Trau. and the Slavs of Spalato feared something similar was going to happen in their city: tensions arose and other incidents against the Italians happened in Spalato in November (the "Caffe Nani" was destroyed and many Italian owned shop were damaged.)
Until the beginning of 1920 the Italians of Spalato never attacked the Slavs (even because of obvious numerical inferiority) and were harassed by Croatian nationalists continuously, as has happened since the end of the XIX century in all Dalmatia.
But after the attack of January 27, 1920 in which were damaged nearly all the Italian-owned shops and the offices of Italian institutions, some Italian sailors of the "Puglia" now under the command of captain Tommaso Gulli, started to defend themselves and the Dalmatian Italians menacing to use their guns.
On July 27 another attack against the Italians of Spalato was done and a group of officials of the "Puglia" found refuge in a place near the docks: captain Gulli ordered a boat to rescue them, but it was blocked by some Slavs and was forced to fire "alarm shots" in the sky to get help.
Soon Gulli went to the rescue with a MAS, but approaching the docks found a huge crowd of nationalist Slavs. Shots were fired to the Italians and for the first time they returned fire. A hand granade was thrown to the Mas and hit the sailor Aldo Rossi and others.
Another shot hit captain Gulli, while the Italians killed a man on the docks, whose name was Matej Mis. Anyway, many versions about what happened were done in the next days, by the Yugoslavians and by the Italians.
Captain Gulli was helped in a Hospital but died the next day, while sailor Rossi survived only a few hours.
In the Kingdom of Italy the reaction to what happened in Spalato was of rage and indignation: in Trieste fascists and nationalists attacked the Hotel Balkan (called in Slovenian "Narodni dom" and center of the Slav activities in Trieste) the next day.
In the following years the Italians of Spalato - under the Yugoslavian rule renamed "Split", as was officially called the city since 1919- were continuously harassed in their institutions, schools and shops & business: they declined in a slow but steady way.
Actually they are only one hundred in Croatian Split, with their association called "Comunitá italiana di Spalato".
Decagon
A decagon is a shape with 10 sides and 10 corners.
All sides of a regular decagon are the same length. Each corner is 144°. All corners added together equal 1440°.
The amount of space a regular decagon takes up is
"a" is the length of one of its sides.
An alternative formula is formula_2 where "d" is the distance between parallel sides, or the height when the decagon stands on one side as base.<br>
By simple trigonometry formula_3.
The side of a regular decagon inscribed in a unit circle is formula_4, where "ϕ" is the golden ratio, formula_5.
Coxeter states that every parallel-sided 2"m"-gon can be divided into "m"("m"-1)/2 rhombs. For the "regular decagon", "m"=5, and it can be divided into 10 rhombs, with examples shown below. This decomposition can be seen as 10 of 80 faces in a Petrie polygon projection plane of the 5-cube. A dissection is based on 10 of 30 faces of the rhombic triacontahedron. The list A006245 defines the number of solutions as 62, with 2 orientations for the first symmetric form, and 10 orientations for the other 6.