From Figure, b=3c
Again, a=2b
=2×3c
=6c
From figure,
6c+a+b=180°
or, a+a+b=180°
or, a+a+a/2=180°
or, 5/2a=180°
a=180×2
5
=72°
#AnswerForTrees
#Carry On Learning
