Question

the sum of angles of a polygon is 3420°. how many sides does it ha​

Answer 1

Answer:

It has 21 sides

Step-by-step explanation:

The formula is

180(n - 2) = 3420 here n refers to the number of sides

180n - 360 = 3420

180n = 3420 + 360

180n = 3780

n = 3780/180

n = 21

Answer 2

Answer:

The answer will be 21 because

Step-by-step explanation:

the sum of angle of polygon is (2n-4)×90

so, 3420°=(2n-4)×90

3420°=180n-360

3420°+360=180n

3780°=180n

n=3780/180

n=21 answer

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