**Calculate the sum of angles of a polygon with : (i) 10 sides (ii) 12 sides (iii) 20 sides (iv) 25 sides**

###### Answers:

(i) No. of sides n = 10

sum of angles of polygon = (n – 2) x 180°

= (10 – 2) x 180° = 1440°

(ii) no. of sides n = 12

sum of angles = (n – 2) x 180°

= (12 – 2) x 180° = 10 x 180° = 1800°

(iii) n = 20

Sum of angles of Polygon = (n – 2) x 180°

= (20 – 2) x 180° = 3240°

(iv) n = 25

Sum of angles of polygon = (n – 2) x 180°

= (25 – 2) x 180° = 4140°