Why was poison gas a potential hazard for the troops that used it? O A. Protective gas masks had not yet been invented.
O B. Safety protocols at the weapons plants were limited.
O C. The artillery that delivered it often misfired.
O D. The wind could change direction and kill the wrong troops.

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°

troy donahue,   i think.