Answer:
Step-by-step explanation:
∠FBA = 130°
∠FBA + p = 180 {Linear pair}
130 + p = 180
p = 180 - 130
p = 50°
AC = BC ⇒ r = p {angles opposite to equal sides are equal}
r = 50°
r + q = ∠FBA {external angle of a Δ equals sum of opposite internal angles}
50 +q = 130
q = 130 - 50
q = 80°
DE // FG , AC is transversal.
t = q {alternate interior angles}
t = 80°
DE // FG , AB is transversal.
s = p {alternate interior angles}
s = 50°
