On what day did the British Army launch a major attack to try and break the stalemate of trench warfare?

In what year was the Russian Tsar overthrown?

The Treaty of Versailles was signed on what day?

When did the German's call for ceasefire?

In what year did the battle of Tsushima start and end?

When was the treaty of Brest-Litovsk signed?

When did the Russian Civil War end?

When did the assassination of Franz-Ferdinand take place?

On what date did Germany invade Belgium?

In what year did the first Moroccan Crisis start?

When did the Bosnian crisis start

In what year did the second Moroccan crisis take place?

During what years did the Balkan local wars take place?

When did the battle of the Somme end?

Find the values of 2x when the area of the triangle is 400 cm^2