I NEED HELP ASAP, I WILL MARK BRAINLIEST The attempt by Radical Republicans to remove President Andrew Johnson from office failed when .
a.
African Americans in Congress announced they would not participate in the process
b.
Robert E. Lee publicly supported Johnson
c.
he announced that he would not seek re-election
d.
the Senate failed by one vote to convict him

i think d

plz correct me if im wrong

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°