Question

If each interior angle of a regular polygon is 160 degree . find no. of diagonals ​

Answer 1

135 diagonal

Step-by-step explanation:

((n-2)×180)÷n) =160

180n-360=160n

20n=360

n=18

where n is no. of sides

for no. of diagonal

n(n-3)/2

18×15/2

15×9

135