Will give branliest for correct

in 668, the silla kingdom was able to unite warring groups on the korean peninsula due to
a. the widespread fear of the rival choson kingdom.
b. the military support of the japanese yamato clan.
c. the spread of shintoism throughout the peninsula.
d. the support of the chinese tang empress wu zhao.

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°

explanation:

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