Question

The interior angles of a pentagon are 100degrees,x,(3x+30),(2x-10) 80 degree find x

Answer 1

Answer:

Correct option is

B

68

o

Given angle of pentagon are x,x+20,x+40,x+60 and x+80

We know that sum of angle of pentagon =540

0

Then x+x+20+x+40+x+60+x+80=540

⇒5x+200=540

⇒5x=540−200

⇒x=

5

340

=68

o

Then smallest angle of pentagon is 68