Answer:
Step-by-step explanation:
Vertically opposite angles are equal.
∠3 = ∠1
4x = x + 54
Subtract x form both sides
4x - x = x + 54 - x
3x = 54
Divide both sides by 3
3x/3 = 54/3
x = 18
∠1 = x + 54 = 18 + 54 = 72°
4) EFC is straight line
∠CFB +∠BFA +∠AFE = 180°
6x + 2 + 8x + 6 + 7x +4 = 180
6x+ 8x + 7x + 2 + 6 + 4= 180
21x + 12 = 180
21x = 180 - 12
21x = 168
x = 168/21
x = 8
