NO LINKS!!! From where did the soil in the Indus Valley receive its rich silt? 1: Indus River
2: Arabian Sea
3: Tigris River
4: monsoon winds

indus river

Explanation:

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°

these acts divided the south into five military districts.