Question

The line ABC and EF are parallel. i) Calculate ii) Give reason
iii) Calculate

Answer 1

Given:

∠DEF = 120

∠CBE = 79

ABC || EF

here BE is transversal

proof :

since from the properties of parallel lines we know that

∠CBE + ∠ABE = 180

79 + ∠ABE = 180

∠ABE = 180 - 79

= 101