PLS HELP ME THIS IS NOT A MULTIPLE CHOICE What was not one of Russia’s achievements in the late nineteenth century?

leading producer of steel, iron, and oil

a world famous author and composer

cities connected by rail and telegraph

large colonial holdings in Africa

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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°

march 8, 1917

explanation: