AB ∥ CD and BC is transversal. ∴ ∠ABE = ∠ECD = 60° [Alternate interior angles] In ∆ABE, we have: ∠EAB + ∠ABE + ∠AEB = 180° [Angle sum property of a triangle]
⇒ 50° + 60° + ∠AEB = 180° ⇒ ∠AEB = 70°
In the given figure, AB||CD. If ∠EAB=50∘ and ∠ECD=60∘ then ∠AEB=?
(a)50∘
(b)60∘
(c)70∘
(d)55∘