B is definitely between those decimals
It would be 56 degrees since it's a vertical angle and to get the obtuse angles you just subtract 180 from 56 and there's your answer. Hope this helped! (':
Step-by-step explanation:
angle ABC= angle ACB= 37° --------- because AB=AC
angle ACB+ angle ACD=180°
37+angle ACD=180
angle ACD=143°
Answer:

Step-by-step explanation:
Given



Required
Determine the length of a
Solve for c in 



Substitute
and
in 



Solve for 4b


Solve for b


Recall that: 

