Who were the central powers during ww1

The Austria-Hungary Empire, The Germany Empire, Ottoman Empire and the Kingdom of Bulgaria.

The Central Powers was Austria-Hungary, Germany, Bulgaria and the Ottoman Empire. Allied powers were Serbia, Russia, France, the United Kingdom, Italy, Belgium and the United States.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°