Question

find the sum of angle 1,2,3,4,5,6,7,8 and9

Answer 1

45° .....................

Answer 2

hii

here is ur solution



According to the question, it form an A. P

given that,

a = 1

d = 2 - 1 = 1


and Sn = S9

Apply formula,


Sn= n/2 (2*a + (n-1) d


S9 = 9/2 (2*1 + (9 - 1) 1

S9 = 9/2 (2+8)

S9 = 9/2 (10)

S9 = 90/2

S9 = 45


Hence, the sum of angle = 45°


hope it helps you