Answer:
d = 63 degree
e = 96 degree
f = 21 degrees
Explanation:
The angle d is the vertical angle theorem with 63 degrees; that is why d is 63 degrees.
The angle e is the vertical angle theorem with 96 degrees; that is why d is 63 degrees.
96 + 63 = 159 degrees
180 - 159 = 21 degrees
So, f = 21 degrees