World war 1 officially began on july 28th 1914 the last peace treaty was signed on november 11th 1918 approximately how many whole years did the war last how many days did it last

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2