Answer :
No. of sides = 22
Let n be 22
Sum of interior angles = (n-2)180
= (22-2)180
= 20*180
= 3600
I hope it is helpful:D
Let n be 22
Sum of interior angles = (n-2)180
= (22-2)180
= 20*180
= 3600
I hope it is helpful:D