Derive the angle sum property of the triangle using the exterior angle property of the triangle. [4 MARKS]
State and prove the Angle Sum Property of a triangle .
(a) Derive the angle sum property of the triangle using the exterior angle property. (b) AE is the angular bisector. ∠4=140∘,∠2=60∘,∠EAC=x. Find x. [4 MARKS]