What Does the D in D-Day Stand For?

In △abc the angle bisectors drawn from vertices a and b intersect at point d. find ∠adb if: ∠c= γ

Which conditions did austria demand of serbia after the assassination of archduke ferdinand? check all that apply. 1. swearing allegiance to the triple alliance 2. accepting responsibility for the assassination 3. turning over control of its military operations 4. surrendering half of its most fertile lands 5. suppressing anti-austrian groups and publications

What do historians call the political, social, or cultural circumstances surrounding an event?