Which factor provided a military advantage during the u. s. civil war? (ush9)
a. more than eighty percent of the nation's factories existed in the north.
b. southern merchant ships outnumbered those controlled by the north.
c. seventy percent of u. s. railroad tracks existed in southern territory.
d. the north made an alliance with france for troops and other aid against the south.

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°

charles lindbergh hope this